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The far point of a myopic person is $40 \, cm$. What type of lens should they wear to see distant objects clearly? Calculate the focal length and the power of the lens they should use.

The change in focal length of an eye lens to focus the image of objects at varying distances is done by the action of the

$A$ person cannot see distinctly objects kept beyond $2\, m$. This defect can be corrected by using a lens of power ........ $D$.

$(a)$ How does the sky appear from the surface of the moon?
$(b)$ What is the cause of the blue colour of the ocean?

At noon,the sun appears white because:

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