Q6 of 36 Page 283

An object of 1 cm in length is placed at a distance of 2f from a convex lens. What is the size of the image formed?

If the Object is placed at distance 2f from a convex lens then a real and inverted image of same size as object will be formed. So, size of image formed = 1 cm


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4

In which of the following media: glass, water and diamond

(a) Light travels slowest.


(b) Light travels fastest.

 5

Given below are refractive indices of a few material media.

Rock salt - 1.54


Ice - 1.31


Dense flint glass - 1.65


Crown glass - 1.52


Arrange the media in the ascending order of optical density.

 7

If the image formed by a lens is always diminished and erect, what is the nature of the lens?

 8

A concave lens has a focal length of 50 cm. Calculate its power.