A concave mirror forms a real image of an object placed in front of it at a distance 30 cm, of size three times the size of object. Find (a) the focal length of mirror (b) position of image.
Reflection of Light
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Question

A concave mirror forms a real image of an object placed in front of it at a distance 30 cm, of size three times the size of object. Find (a) the focal length of mirror (b) position of image.

KnowledgeBoat · Accepted Answer

Given, (a) Distance of the object (u) = 30 cm (negative) Image height = 3 times the height of object So, magnification (m) = 3 (negative for the real image) Hence, the image is formed 90 cm in front of the mirror. Mirror formula: Substituting the values in the mirror formula we get, Hence, focal length of the mirror = 22.5 cm (b) The image is formed 90 cm in front of the mirror

Computer Applications

A concave mirror forms a real image of an object placed in front of it at a distance 30 cm, of size three times the size of object. Find (a) the focal length of mirror (b) position of image.

Reflection of Light

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