Q1 of 31 Page 185

Which one of the following materials cannot be used to make a lens?

Clay cannot be used to make a lens. Because it is opaque material, and light cannot pass through it.

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2

A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex lens if the image is equal in size to the object? Also find the power of the lens.

 3

Find the power of a concave lens of focal length 2 m.

 2

The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object?

 3

Where should an object be placed in front of a convex lens to get a real image of the size of the object ?