CUET PG Physics Optics PYQs with Answers

CUETPG Physics Optics PYQs section focuses on important concepts frequently asked in the CUET PG Physics examination. It covers key topics such as lens behavior, focal length calculations, thin film interference, diffraction conditions, and the fundamental principles of light propagation. These previous year questions help students strengthen their conceptual understanding and improve their problem-solving skills.

The questions also explain concepts like destructive interference, path difference in thin films, and single-slit diffraction minima and intensity variations. By practicing these PYQs, candidates can understand the exam pattern, identify frequently tested optics concepts, and prepare more effectively for the CUET PG Physics entrance exam.

CUET PG Physics Optics 

Optics is an important unit in the CUET PG Physics syllabus. Questions usually test both conceptual understanding and numerical problem-solving from classical and modern optics. CUET PG Physics Optics PYQ session discusses Previous Year Questions (PYQs) related to Optics for the CUET PG examination.

The focus is on understanding the fundamental principles and their application in solving problems from key areas such as Interference, Polarization, and Ray Optics, which are frequently tested topics. This analysis aims to strengthen conceptual clarity for exam preparation.

CUET PG Physics Optics PYQs

These CUET PG Physics Optics PYQs help candidates understand important concepts and question patterns frequently asked in the CUET PG Physics examination.

1. A hollow double concave lens is made of a very thin transparent material and can be filled with air or liquids L1 or L2. Their refractive indices are related as n2 > n1 > 1. The lens will diverge a parallel beam of light if it is filled with:

A. Air inside and air outside
B. Air inside and immersed in L1
C. L2 inside and L1 outside
D. L1 inside and L2 outside

Correct Answer: C

2. For a lens to behave as a diverging lens, the focal length must be:

A. Positive
B. Negative
C. Zero
D. Infinite

Correct Answer: B

3. The relationship used to calculate the focal length of a thin lens in a medium is:

A. 1/v − 1/u = 1/f
B. (μl/μs − 1) (1/R1 − 1/R2)
C. μ = c/v
D. v = f + u

Correct Answer: B

4. A graph between object distance (u) and image distance (v) for an equiconvex lens gives a point where u = −10 cm and v = 10 cm. The focal length of the lens is:

A. 10 cm
B. 2.5 cm
C. 5 cm
D. 20 cm

Using lens formula:

1/v + 1/u = 1/f

1/10 + 1/10 = 1/f

f = 5 cm

Correct Answer: C

5. If the same graph corresponds to an equiconcave lens, the focal length would be:

A. +5 cm
B. −5 cm
C. +10 cm
D. −10 cm

Correct Answer: B

6. Consider the following statements related to relativity and light:

7. A particle can travel in free space faster than the velocity of light.

8. A particle can travel in a material medium faster than the velocity of light in free space.

9. A particle cannot travel in a material medium.

10. Velocity of light in free space is an absolute constant.

Which of the following statements are incorrect?

A. 1 only
B. 1, 2 and 3
C. 2 and 3
D. 4 only

Correct Answer: B

7. A parallel beam of light of wavelength λ is incident normally on a thin film of thickness t. For destructive interference in reflection, the condition is:

A. 2t = nλ
B. t = nλ
C. 2t = (2n − 1) λ / 2
D. t = (2n + 1) λ

Correct Answer: C

8. In thin film interference at normal incidence, the path difference between the two reflected rays is:

A. μt
B. 2t
C. 2μt
D. μ/t

Correct Answer: C

9. In single slit Fraunhofer diffraction, the condition for the first minimum is:

A. a sinθ = λ/2
B. a sinθ = λ
C. a sinθ = 2λ
D. a sinθ = 3λ

Correct Answer: B

10. In a single slit diffraction pattern, if the first minimum occurs at a certain direction, the path difference between extreme rays from the slit is:
    
    

A. λ/2
B. λ
C. 2λ
D. 3λ

Correct Answer: B

11. For the first diffraction minimum, the path difference between ray 1 and ray 2 (adjacent points of the slit) is:

A. λ
B. λ/2
C. 2λ
D. λ/4

Correct Answer: B

12. If I0 is the intensity of the principal maximum in single slit diffraction, what will be the intensity when the slit width is doubled?

A. 2I0
B. I0/2
C. 3I0
D. 4I0

Since intensity I ∝ (amplitude)² and amplitude ∝ slit width.

Correct Answer: D

CUET PG Physics Optics PYQs: Check Detailed Video Solutions

Watch the video below to understand the CUET PG Physics Optics PYQs with detailed step-by-step explanations. The session discusses important topics such as interference, diffraction, polarization, optical instruments, and thin film interference, helping you learn the concepts and problem-solving methods commonly asked in the CUET PG Physics exam.