Light - Reflection and RefractionPractice Questions & MCQs

Q1. Which mirror gives a wider field of view (NCERT)?

• A.concave mirror
• B.plane mirror only
• C.a concave mirror at the focus
• D.convex mirror

Answer: D. convex mirror

Q2. A concave mirror polished by a planetarium guide at a roadside tea stall has its centre of curvature 16 cm from the pole; how far from the pole is the focus?

• A.4 cm
• B.8 cm
• C.32 cm
• D.16 cm

Answer: B. 8 cm

The focal length of a spherical mirror is half its radius of curvature: f = R/2. Here R = 16 cm, so f = 16/2 = 8 cm.

Q3. If a convex blind-turn mirror surveyed by a jeweller in a curved-mirror gallery curves with radius 16 cm, what focal length does it carry?

• A.8 cm
• B.16 cm
• C.32 cm
• D.4 cm

Answer: A. 8 cm

The focal length of a spherical mirror is half its radius of curvature: f = R/2. Here R = 16 cm, so f = 16/2 = 8 cm.