Physics Faqs

Updated on Jan. 5, 2021 01:19 PM IST by Lakshmi Arya

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Q. A 5 cm tall object is placed perpendicular to principal axis of a convex lens of focal length 10 cm .if the object is placed 30 cm away from the lens, find the position, size and nature of image.

Ans: According to the question: Object distance,u = -30 cm Focal length ,f = 10 cm Let the image distance be v By lens formula: 1/v - 1/u = 1/f  1/v = 1/u + 1/f 1/v = 1/-30cm + 1/10cm 1/v = (-... read more

Q. A spherical mirror and a thin spherical lens each have a focal length of -15 cm. what would be the type of mirror and lens these are?

Ans: As the focal length given is negative , so the mirror would be concave mirror and lens would be concave lens because the image formed by these on focus  would be against the direction of incident... read more

Q. How is the focal length of a spherical mirror is related to the radius of curvature?

Ans: The focal length of a spherical mirror is equal to half of its radius of curvature.... read more