CBSE Class 12 Ray Optics and Optical Instruments Multiple Choice Questions with Answers. MCQ Questions Class 12 Ray Optics and Optical Instruments with Answers Is Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Ray Optics and Optical Instruments MCQs with Answers to know their preparation level.
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MCQ Questions Class 12 Ray Optics and Optical Instruments with Answers - Set - 3
Question 1:
A beam of light is incident at 60° to a plane surface. The reflected and refracted rays are perpendicular to each other. What is the R.I. of the surface:
(a) 1/√3
(b) √3
(c) 1/3
(d) 3
Correct Answer – (B)
Question 2 :
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 w ater is:
(a) 8/9
(b) 9/8
(c) 7/6
(d) 2
Correct Answer – (B)
Question 3 :
Light year is the unit of:
(a) distance
(b) time
(c) intensity of light
(d) None of these
Correct Answer – (A)
Question 4 :
A ray of light travelling in air is incident of a glass slab. The ray gets partly reflected and partly refracted. The phase difference between the reflected and the refracted waves is :
(a) π/2
(b) π/4
(c) π
(d) Zero
Correct Answer – (C)
Question 5 :
Two points P and q are situated at the same distance from a source of light but on opposite sides. The plane difference between the light waves passing through P and q will be:
(a) n
(b) 2n
(c) π/2
(d) zero
Correct Answer – (D)
MCQ Questions Class 12 Ray Optics and Optical Instruments with Answers
Question 6 :
The angle of minimum deviation for an equilateral glass prism is 30°. Refractive index of the prism is:
(a) 1/√3
(b) √2
(c) 1
(d) can’t be determined
Correct Answer – (B)
Question 7 :
If a mirror is approaching you at a speed of 10 ms^1, the speed with which your image approach you is:
(a) 10 ms-1
(b) 5 ms-1
(c) 20 ms-1
(d) 15 ms-1
Correct Answer – (C)
Question 8 :
Which of the following cannot be polarised?
(a) radiowaves
(b) transverse waves
(c) sound waves
(d) X-rays
Correct Answer – (C)
Question 9 :
The phase difference between the electric and the magnetic field vectors in electromagnetic waves is
(a) π/2
(b) π/4
(c) π
(d) Zero
Correct Answer – (D)
Question 10 :
Which of-the following is not a property of light?
(a) It can travel through vacuum
(b) It has a finite speed
(c) It requires a material medium for its propagation
(d) It involve transportation energy
Correct Answer – (C)
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