CBSE Class 8 Science - Light (3)

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CBSE Class 8 Science - Light (3)

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Q.1. Complete the following sentences

a) The coloured, disc shaped diaphragm in the eye is called the …………..

b) In regular reflection, the reflected rays remain ……………. to each other.

c) The number of image is infinite when the angle between the mirrors is …………….

Q.2.Name the following

a) Light of all colours are mixed in a certain proportion.

b) Blindness arising out of lack of Vitamin A in the diet.

c) The rays of beam are reflected in different directions.

d) A protective white membrane covering most of the eye ball.

Q.3.Define the following terms

a) Braille

b) Lateral Inversion

c) Kaleidoscope

d) Dispersion

e) Spectrum

f) Accommodation

g) Cataract

Q.4.Differentiate between the following

b) Reflection and Refraction

c) Myopia and hypermetropia

Q.5.Give reasons for the following

a) A shiny metal utensil forms an image, but the image is not clear as that formed by a mirror.

b) You see a clear, bright image of an object in a mirror.

c) When a mirror is held behind your head after a haircut, not only you see the back of your head, you also see

innumerable images of yourself.

Q.6.Answer the following in not more than 20 words.

b. What happens to the rays of light in case of diffuse reflection?

c. An object is placed 20 cm in front of a plane mirror. Where is the image formed? How far is it from the

mirror?

d. An object is placed between two mirrors that are at 60° to each other. How many images are formed?

Q.7.Answer the following in not more than 40 words.

a. State the laws of reflection of light.

b. What do you understand by the blind spot of the eye?

Q.8.Answer the following in not more than 100 words.

a. What vision related problems occur when the diet lacks Vitamin A?

b. Describe the structure of the eye with the help of a diagram.

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