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# A spherical mirror and a thin spherical lens have each a focal length of -15 cm. The mirror and the lens are likely to be - CBSE Class 10 - Science

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ConceptRepresentation of Images Formed by Spherical Mirrors Using Ray Diagrams - Concave Mirror

#### Question

A spherical mirror and a thin spherical lens have each a focal length of -15 cm. The mirror and the lens are likely to be

• both concave

• both convex

• the mirror is concave and the lens is convex

• the mirror is convex, but the lens is concave

#### Solution 1

both concave

By convention, the focal length of a concave mirror and a concave lens are taken as negative. Hence, both the spherical mirror and the thin spherical lens are concave in nature.

#### Solution 2

Both concave

According to the sign convention, the focal length for both a concave mirror and a concave lens is negative.

Is there an error in this question or solution?

#### APPEARS IN

NCERT Solution for Science Textbook for Class 10 (2019 to Current)
Chapter 10: Light – Reflection and Refraction
Q: 4 | Page no. 185
NCERT Solution for Science Textbook for Class 10 (2018 to Current)
Chapter 10: Light - Reflection and Refraction
Q: 4 | Page no. 185
Solution A spherical mirror and a thin spherical lens have each a focal length of -15 cm. The mirror and the lens are likely to be Concept: Representation of Images Formed by Spherical Mirrors Using Ray Diagrams - Concave Mirror.
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