Ray Optics And Optical Instruments Class 12 Mcq in English

Ray Optics And Optical Instruments Class 12 Mcq in English | Class 12 Physics Mcq In English | ray optics class 12 mcqs with answers | ray optics class 12 mcq pdf Download | class 12 physics chapter wise objective questions in English

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Ray Optics And Optical Instruments Class 12 Mcq in English

1. The phase difference between the electric and the magnetic field vectors in electromagnetic waves is

• (A) π/4
• (B) π/2
• (C) π
• (D) Zero

2. Which of the following cannot be polarised ?

• (A) radiowaves
• (B) transverse waves
• (C) sound waves
• (D) X-rays

3. Light year is the unit of

• (A) distance
• (B) time
• (C) intensity of light
• (D) None

4. The refractive indices (R.I.) of glass and water with respect to air are 3/2 and 4/3 respectively. The R.I. of glass w.r. to water is

• (A) 8/9
• (B) 9/8
• (C) 7/6
• (D) 2

5. The angle of minimum deviation for an equilateral glass prism is 30°. Refractive index of the prism is

• (A) 1/√2
• (B) √3
• (C) 1/3
• (D) none

6. A thin glass ( RI = 3/2 ) lens has optical power of – 5D in air. Its optical power in a liquid medium with RI = 1.6 will be

• (A) – 2.5 D
• (B) 25 D
• (C) – 1D
• (D) 0.625

7. When a polaroid is rotated, the intensity of light varies but never reduces to zero. It shows that the incident light is

• (A) unpolarised
• (B) completely plane polarised
• (C) partially plane polarised
• (D) None

8. wo lens of power -15D and + 5D are placed in contact co-axially. The focal length of equivalent lens is

• (A) – 10 cm
• (B) – 20 cm
• (C) + 10 cm
• (D) none

9. The air bubble inside water shine due to

• (A) Reflection
• (B) Refraction
• (C) T.I.R.
• (D) None

10. Far point of a myopic eye is 40 cm. The dioptic power of a corrective lens is

• (A) 40D
• (B) – 4D
• (C) – 2.5 D
• (D) None

11. The angle of deviation for a prism is greatest for

• (A) violet
• (B) red
• (C) orange
• (D) yellow

12. A double convex air bubble in water behaves as

• (A) Convergent lens
• (B) divergent lens
• (C) plane slab
• (D) concave mirror

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