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Home » A spherical mirror and a thin spherical lens have a focal length of -15 cm. The mirror and the lens are likely to be
A spherical mirror and a thin spherical lens have a focal length of -15 cm. The mirror and the lens are likely to be
CBSE | Class 10 | Light Reflection and Refraction | NCERT Exemplar | Science
A spherical mirror and a thin spherical lens have a focal length of -15 cm. The mirror and the lens are likely to be

(a) both concave

(b) both convex

(c) the mirror is concave and the lens is convex

(d) the mirror is convex, but the lens is concave

Answer –

(a) Both concave

The focal length of a concave mirror and a concave lens is treated as negative by convention. As a result, the spherical mirror and narrow spherical lens are both concave.

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