Human Eye and Colourful World — Science STD 10 — Question

Fill in the following blanks with suitable words:
The ciliary muscles control the shape of the _____.

Complete the following sentences:
A long-sighted person cannot se ______ objects clearly. Long-sightedness can be corrected by using ______ lenses.

Fill in the following blanks with suitable words:

A concave mirror _____ rays of light whereas a convex mirror ______ rays of light.

Fill in the following blanks with suitable words:
Biomass is another form in which ___________ energy manifests itself.

______ is the commercial unit of electrical energy.

Fill in the following blanks with suitable words:
Light bends when it passes from water into air. We say that it is ___________.

Fill in the blanks with suitable words:
White light is composed of _____ I The colour of white light deviated through the largest angle by a prism is ____.

Having two eyes enables us to judge ______ more accurately.

A person is short-sighted if his eyeball is too ____ Spectacles with a _____ lens are needed. A person is long sighted if his eyeball is too _____ Spectacles with a ____ lens are needed. These focus light rays exactly on to the _____.

White light is composed of _____ I The colour of white light deviated through the largest angle by a prism is ____.