Q1 of 27 Page 132

A man wants to get a picture of a zebra. He photographed a white donkey after fitting a glass with black stripes on to the lens of his camera. What photo will he get? Explain. (AS1)

• The man will get the photograph of a white donkey with less intensity. Moreover, the whole photograph will have black strips instead of only the body of the donkey.

• The black strips will block the light coming from the object. Thus, refraction will take place only where the lens is clear. Thus, providing a very hazy image.


• The photograph will look like the picture below.



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2

Two converging lenses are to be placed in the path of parallel rays so that the rays remain parallel after passing through both lenses. How should the lenses be arranged? Explain with a neat ray diagram. (AS1)

 3

The focal length of a converging lens is 20 cm. An object is 60 cm from the lens. Where will the image be formed and what kind of image is it? (AS1)

 4

A double convex lens has two surfaces of equal radii ‘R’ and refractive index n 15. Find the focal length 'f. (AS1)

 5

Write the lens maker's formula and explain the terms in it. (AS1)