A small bulb is placed at the focal point of a converging lens. When the bulb is switched on, the lens produces

a convergent beam of light

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a divergent beam of light

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a parallel beam of light

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a patch of coloured

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Solution

The correct option is D a parallel beam of light
When a bulb is placed at focus of converging lens then the light rays of bulb from focus will get refracted from the convex lens and become to parallel to principal. They produce a parallel beam of light after refraction from convex lens.
Option C is correct.

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Similar questions

Q. A small bulb is placed at the focal point of a converging lens. When the bulb is switched on, the lens produces:

(a) a convergent beam of light
(b) a divergent beam of light
(c) a parallel beam of light
(d) a patch of coloured light

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Q. A beam of light converges at a point P. Now convex lens of focal length 20 cm placed the path of the convergent beam 12 cm from the point at which the beam converges now

Q. A diverging lens with magnitude of focal length

25 c m

is placed at a distance of

15 c m

from a converging lens of magnitude of focal length

20 c m

. A beam of parallel light falls on the diverging lens. The final image formed is :

A beam of light converges at a point P. Now a lens is placed in the path of the convergent beam 12 cm from P. At what point does the beam converge if the lens is (a) a convex lens of focal length 20 cm, and (b) a concave lens of focal length 16 cm?

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