Q1 of 84 Page 299

Name the lens which always forms a virtual image of an object.

A concave lens always forms the virtual image of an object because it is diverging lens. The image formed is erect as shown in the figure below.


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6

If a ray of light enters from alcohol to air. The refractive index of alcohol is 1.36. Calculate the speed of light in alcohol with respect to air.

 7

The refractive index of glass with respect to air is and refractive index of water with respect to air is . What will be the refractive index of water with respect to glass?

 2

Discuss the case when a convex lens forms a virtual and enlarged image.

 3

Which lens would you prefer to use while reading small letters from a dictionary?