An object is placed at infinite distance from a concave lens. If m is magnification obtained in the size of the image; then

(1) m=0

(2) m<<-1

(3) m>-1

(4) m<<+1

Subtopic:  Lenses |
 50%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The diameter of a plano-convex lens is 5 cm and thickness at the centre is 5 mm. If the refractive index of the material of the lens is 1.5, the focal length of the lens is (approximately)

1.  13 cm

2.  15 cm

3.  20 cm

4.  6.35 cm

Subtopic:  Lenses |
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

A point object O is placed at distance 20 cm from a biconvex lens of radius of curvature 20 cm and μ=1.5. The final image produced by lens and mirror combination will be at

(1) 10 cm from the mirror

(2) 20 cm from lens

(3) -20 cm from lens

(4) -15 cm from the mirror

Subtopic:  Refraction at Curved Surface |
 53%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

If the angle of a triangular prism is A and the refractive index of the material is μ, then under what condition will there be no emergent ray?

1.  A = 2 sin-11μ

2.  A < 2 sin-11μ

3.  sin-11μ < A < 2 sin-1μ

4.  A > 2 sin-11μ

Subtopic:  Prisms |
 55%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A thin lens whose power is +2D is cut into two pieces perpendicular to the principal axis. The focal length of each part will be

(1) 1 m

(2) 0.1 m

(3) 75 cm

(4) 0.05 m

Subtopic:  Lenses |
 75%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A light ray is incident at an angle of 60° on one face of a  prism of a refractive angle 90°. If light ray grazes the second face, then the refractive index of the material of prism is-

1. 32

2. 2

3. 52

4. 72

Subtopic:  Prisms |
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The near point of a hypermetropic eye is 1m. What is the power of the lens required to correct this defect?

(1) -3 D

(2) +3 D

(3) +1 D

(4) -1.75 D

Subtopic:  Human Eye |
 61%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The minimum magnifying power of an astronomical telescope is 40. If the length of the telescope is 205 cm, then the focal length of its field lens is:

1. 5 cm

2. 200 cm

3. 40 cm

4. 140 cm

Subtopic:  Telescope |
 66%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A boy with defective eye-sight cannot see things beyond 50 cm. The corrective lens required has the power:

1. +1 D

2. +2 D

3. -1 D

4. -2 D

Subtopic:  Human Eye |
 69%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The focal lengths of the objective and eyepiece of a terrestrial telescope are 50 cm and 10 cm respectively. The magnifying power of the telescope when the final image is formed at infinity is

(1) 3.75

(2) -2.5

(3) -4.25

(4) +5

Subtopic:  Telescope |
 87%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh