A few physics questions on light phenomena in the second year of junior high school

1.(1) Reflected light; Transmit light.

2) The position of the image and the size of the object.

3) The distance from the image to the mirror is equal to the distance from the object to the mirror.

4) Because the front and back surfaces of the glass plate are reflective surfaces, they are imaged separately and the distance between the two reflective surfaces and the candle is different.

Two images that do not coincide.

2.The phenomenon of reflection of light.

5.No picture, can't solve it, sorry!

1.(1) Reflected light, light transmission, (2).The position of the image, the size of the image and the object (3).Equal (4) One is the image formed by the reflection of light, and the other is the image formed by the refraction of light.

2.Reflection of light.

Let the angle between L2 and OM be angle 1, then the angle between L1 and OM is equal to angle 1, the angle between L1 and L2 is 180 degrees 2X angle 1, let the angle 2 of the angle between L2 and On, then the angle between L3 and ON is also equal to angle 2, the angle between L2 and L3 is 180 degrees 2X angle 2, and the angle 1 + angle 2 90 degrees, so the angle between L1 and L2 + the angle between L2 and L3 is 180 degrees, and the internal angles are complementary, and the two straight lines are parallel. Degree.

Reflected light, transmitted light 2) The position of the image and the size of the object are compared 3) The distance between the image and the object is equal to the mirror. 4) The plane mirror has two reflective surfaces before and after, which are imaged separately, and the two images do not coincide, so two images are seen.

2 The phenomenon of reflection of light. 3、c

Good place viurgrrg Tang people Tang people and how he has dusk a Hetian jade one.

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Problem description: The following phenomena are the reflection of light ( ).

A is like a chopstick in the water, and the edema looks like it is bent upward.

bThe reflection of the lake in the water.

C man was under the street lamp, and the shadow of a man appeared on the ground.

D. Imaging of small holes.

Analysis: a refraction.

b. Reflection of the face.

cLight travels in a straight line.

d Ibid.

Light phenomena are: linear propagation of light, refraction of light, and reflection of light.

The straight propagation of light, the refraction of light, the reflection of light.

Reflection refraction propagates in a straight line.

Diffuse reflection is a way to see inclearly and incompletely, because the reflected light in only one direction is received by the human eye.

Non-luminous objects are those that cannot emit light on their own, and some can reflect light, such as the moon, which does not emit light itself, but only reflects sunlight. Diffuse reflection is due to the irregularity of the reflector, and the flatter the surface, the stronger the directionality of the light, such as a plane mirror.

1, greater than. 2. Small.

3, small, same.

4. Convex lens,

2.When using the camera:

1) The distance of the object from the camera lens is greater than the distance of the film from the camera lens (greater than, less than, or equal to) - because the object distance is greater than 2x the focal length, and the image distance is between 1x and 2x the focal length.

2) The farther the object is from the lens of the camera, the smaller the image of the object on the negative; According to "things are far away like small things".

3) The image on the camera negative must be smaller than the object, and the object and the image are on both sides of the lens. -- The object is a real image of a reduced handstand at a focal length of 2x.

3.The lens of the projector is equivalent to a convex lens, and the light from the pattern passes through this lens to form a magnified inverted real image, which is reflected onto the screen after passing through the plane mirror. --The object is magnified and inverted within 2x the focal length.

4.We use a magnifying glass to look at the object and can find:

1) The image of the object being observed is magnified;

2) The object and the image formed by the magnifying glass are on the same side of the lens, and the closer the magnifying glass is to the object, the smaller the image is formed; The farther the object is from the magnifying glass, the larger the image will be. -The magnifying glass is a virtual image, which cannot be carried by a light screen, as can be seen by simple experiments.

2.(1) greater than (because the photograph is a handstand and shrinking real image) 2) smaller (the distant image of the object becomes smaller than the near image).

3) Small, both sides (ref. 1).

3.Convex lens, inverted, magnifying, real (image), flat mirror.

4.(1) Magnification (magnifying glass imaging).

2) Same (side), small, large.

2.1, greater than.

2. Small. 3) Small, both sides.

3.Convex lens, inverted, magnifying, real (image), flat mirror.

4.(1) Amplification.

2) Same (side), small, large.

The distance between the Earth and the Moon is to the 8th power).

yes s=t*v/2=

The radius of the Moon is 1738 km with a diameter of 3476

The diameter of the Moon is about 3476 km, which is 3 of the Earth's 11. The volume is only 1 49 of the earth, and the area is not as large as that of Asia. The mass of the Moon is about 735 billion tons, which is equivalent to 1 81 of the mass of the Earth, and the gravity of the Moon is almost equal to 1 6 of the Earth's gravity

way;The diameter of the coin is measured.

2 Facing the moon, it is best to place the coin between your eyes and the moon around the 15th day of the lunar month, and move the coin to just block the moon.

3. Measure the distance between the eye and the coin at this time.

4 Based on the distance between the Earth and the Moon and the data measured in the experiment, the diameter of the Moon is calculated using the knowledge of triangles.

Diameter of the Moon = Diameter of the Coin * Distance Between the Earth's Moons The distance between the eyes and the coin.

1. Because the air is moving, what people see is the image they make.

2. The method of small hole imaging can be used. Use the small hole to image the sun on the light screen, and use a scale to measure the distance from the image to the light screen and the diameter of the image, the diameter of the sun = the diameter of the image * the distance between the sun and the earth The distance from the image to the light screen.

3、ab=be*cd/df=18*

1. Because the air is heated and the density changes, the light rays are refracted through this area, and the direction of propagation is slightly distorted.

18 (1) the same size, shape, etc.; so that the virtual image of A can coincide with B.

2) A: A candle light is too strong.

3) Add a faint external light source, such as a candle.

Two. (1) Light pollution, noise pollution.

2) The glass wall curtain is equivalent to a reflector, reflecting the strong light of the sun into Xiaohai's eyes.

3) Report the situation to the environmental protection department and the community in order to solve the problem as soon as possible.

First, it can be compared to the virtual image in the plane mirror! 2. It should be observed on side A. Xiao Ming's visual plane should be parallel to the mirror! 3. You can use a flashlight to irradiate checkers!

1. Contour and verification are contoured.

2, a, the glass and the table top are not vertical.

3. Shine a flashlight on checkers.

18(1) Equal size Compare the size of the plane mirror image.

2) A candles are not in the same plane.

3) Shine checkers with a flashlight.

2. (1) Light pollution, sound pollution.

2) Sunlight is reflected into the eye of the sea.

3) Moving.