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Lens Maker's Formula

The ability o...

Question

The ability of a lens to converge or diverge light rays depends on :

A

Principal axis

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B

Focal length

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C

Object distance

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D

Image distance

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Solution

The correct option is C Focal length
The ability of a lens to converge or diverge light rays depends on the focal length of the lens. If the focal length of the lens is small, then the focus of the lens lies nearer to the lens and thus the lens converges or diverges the incident rays nearer to the lens and vice-versa.

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Q. A person got his eyes tested by an optician. The prescription for the spectacle lenses to be made reads :
Left eye : +2.50 D
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(a) State whether these lenses are thicker in the middle or at the edges.
(b) Which lens bends the light rays more strongly?
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Q. State whether the following statements are 'true' or 'false' by writing T/F against them.
(a) A convex lens has a divergent action and a concave lens has a convergent action.
(b) A concave lens, if kept at a proper distance from an object, can form its real image.
(c) A ray of light incident parallel to the principal axis of a lens, passes undeviated after refraction.
(d) A ray of light incident at the optical centre of lens, passes undeviated after refraction.
(e) A concave lens forms a magnified or diminished image depending on the distance of object.

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