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Image Formation by Convex Lens

If there is a...

Question

If there is a convex lens which is made of a material whose optical density is less than that of air, then

A

it remains a converging lens

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B

it becomes a diverging lens

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C

it doesn't refract light

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D

it reflects the light

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Solution

The correct option is B
it becomes a diverging lens

As the optical density of the lens is less than that of air, the speed of light increases in the lens instead of being slowed down. So, this convex lens diverges the light instead of converging it. Hence, it becomes a diverging lens.

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