An object is placed at a distance of 20cm in front of a spherical mirror and image is formed 10 cm behind the mirror. Find the focal length and kind of spherical mirror?
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Correct option is
A
d a e b c
ans:(A) d a e b c
Initially proper sign is assigned to object distance and the image distance according to the sign convention.The values of u and v are substituted in the mirror formula f1=u1+u1. The sign of f indicates whetherthe mirror used is convex or concave.
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Answer:
convex mirror
Step-by-step explanation:
It is said that the object is placed in front of the mirror at a distance of 10cm. Therefore, u=−10cm. The focal length of a convex mirror is always positive. Therefore, f=15cm.
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