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Human eyes have convex lens....

Human eyes have convex lens.

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Our eyes have a convex lens whose focal length can be changed at will by the contraction and relaxation of ciliary muscles.

A student studying the similarities and differences between a camera and the human eye makes the following observations. (I) Both the eye and the camera have convex lenses. (II) In order to focus, the eye lens expands or contracts while the camera lens moves forward or backward. (III) The camera lens produces upside down real images while the eye lens produces only upright real image. (IV) A screen in camera is equivalent to the retina in the eyes. (V) A camera ajusts the amount of light entering in it by adjusting the apeture of the lens. In the eye the cornea controls the amount of light. The correct statemetns are :

What is a convex lens ?

(a) How does the convex eye-lens differ from the ordinary convex lens made of glass ? (b) List, in order, the parts of the eye through which light passes to reach the retina.

The human eye is very similar to a photographic camera. The figure given shows the main parts of a photographic camera , Now answer the question. State one difference between the human eye lens and camera lens

What is a lens? Distinguish between a convex lens and a concave lens. Which of the two is a converging lens: convex and lens or concave lens?

State two differences between a convex lens and a concave lens. Give one use of convex lens and one of concave lens.