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Physics

Focus and Focal Length

a) For concav...

Question

a) For concave mirror focal length is taken as ........
b) For convex mirror, radius of curvature is taken as ........

a = p o s i t i v e, b = n e g a t i v e

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a = n e g a t i v e, b = p o s i t i v e

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a = p o s i t i v e, b = p o s i t i v e

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a = n e g a t i v e, b = n e g a t i v e

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Solution

The correct option is B $a = n e g a t i v e, b = p o s i t i v e$
According to cartesian system focal length of a concave mirror is negative whereas radius of curvature of convex mirror is positive.

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Q. a) For convex lens, distance of real image from the optical centre is .........
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a) For concave mirror focal length is taken as ........
b) For convex mirror, radius of curvature is taken as ........

The correct option is B $a = n e g a t i v e, b = p o s i t i v e$
According to cartesian system focal length of a concave mirror is negative whereas radius of curvature of convex mirror is positive.

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a) For concave mirror focal length is taken as ........b) For convex mirror, radius of curvature is taken as ........

The correct option is B a=negative,b=positiveAccording to cartesian system focal length of a concave mirror is negative whereas radius of curvature of convex mirror is positive.

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a) For concave mirror focal length is taken as ........
b) For convex mirror, radius of curvature is taken as ........

The correct option is B $a = n e g a t i v e, b = p o s i t i v e$
According to cartesian system focal length of a concave mirror is negative whereas radius of curvature of convex mirror is positive.