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?

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.

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?

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.

Class 10 · Science · Physics

Light - Reflection and Refraction MCQs

Take an interactive Light - Reflection and Refraction quiz for Class 10 Science - tap an answer for instant feedback and a step-by-step solution. These are a few sample questions; practice the full Light - Reflection and Refraction set free on the RankByte app.

Topics covered

Laws of ReflectionSpherical Mirrors (Concave and Convex)Mirror Formula and MagnificationRefraction of Light and Refractive IndexLenses (Concave and Convex)Lens Formula and MagnificationPower of a LensSpherical mirrorsRefraction and lenses

Practice Light - Reflection and Refraction by topic

Focused MCQ quizzes for each topic.

Laws of Reflection Lens Formula and Magnification Lenses (Concave and Convex)Mirror Formula and Magnification Power of a Lens Refraction and lenses Refraction of Light and Refractive Index Spherical Mirrors (Concave and Convex)Spherical mirrors

Light - Reflection and RefractionQuiz - Solve & Score

A few sample questions with instant answers and solutions - the full set is in the app.

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.