Question

An optical device has been given to a student and he determines its focal length by focusing the image of a sun on a screen placed 24 cm from the device on the same side of the sun.
(a) Name the optical device
(b) Find its focal length

Answer 1

Explanation:

Solution An Optical Device Has Been Given to a Student and He Determines Its Focal Length by Focusing the Image of the Sun on a Screen Placed 24 Cm from the Device on the Same Side as the Sun. Concept: Reflection of Light - Spherical Mirrors.

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Answer 2

Answer:

the optical device is a concave. mirror because when light rays from a distinct objects (Here it is sun) fall on this mirror, it's image is formed at the focus of the mirror on the same said as the object. Thus in the given case. distance between the mirror and the scene is the focal length of the concave mirror. Hence the focal length of the given device (concave mirror) is 24 cm ..

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