Two thin convex lenses of focal length 20cm and 5cm are placed 10cm apart. The power of the combination of lenses is 

1. 10D

2. 15D

3. 20D

4. 25D

Subtopic:  Lenses |
 71%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

A converging beam of light forms a point image on a screen of an object. A plane glass plate of thickness 2 cm and a refractive index 32 is introduced in the path of the beam. The screen should be shifted with respect to its initial position to obtain point image on the screen will be

(1) 3 cm

(2) 1.5 cm

(3) 0.67 cm

(4) 1.33 cm

Subtopic:  Refraction at Plane Surface |
 70%
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Hints

Select the incorrect option

(1) A plane mirror always forms a virtual image

(2) The virtual image formed by a concave mirror is always enlarged

(3) The critical angle is always defined in the denser medium

(4) A glass slab cannot deviate the light

Subtopic:  Reflection at Plane Surface |
 52%
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Hints

Select the correct option.

(1) The velocity of light is constant in all media

(2) A convex lens always forms a real image

(3) If the aperture of the lens is halved then image size will be halved

(4) The ray optics is applicable when the size of the obstacle is more than the wavelength of light

Subtopic:  Lenses |
 69%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

The refractive index of the material of an equilateral prism for yellow light is 1.5. The angle of minimum deviation of the prism for yellow light is (sin 49° = 0.75)

1. 38°

2. 30°

3. 52°

4. 60°

Subtopic:  Prisms |
 57%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

In case of a compound microscope, the image formed by the objective lens is

(1) Virtual, erect and diminished

(2) Real, erect and magnified

(3) Virtual, inverted and enlarged

(4) Real, inverted and enlarged

Subtopic:  Simple & Compound Microscope |
 68%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

A plano-convex lens of focal length 10 cm is made of glass of refractive index 1.5. If the plane surface of the convex lens is polished, then the focal length of the resultant combination will be

(1) 5 cm

(2) 10 cm

(3) 15 cm

(4) 12.5 cm

Subtopic:  Lenses |
 63%
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Hints

A parallel narrow beam of light traveling through the water in a container incident on an air bubble of radius 8 mm. What will be the distance of the image obtained due to the refraction of the beam on the first face of the air bubble from the centre of the bubble? [μwater=43]

(1) 17.2 mm

(2) 32 mm

(3) 41.5 mm

(4) 25.75 mm

Subtopic:  Refraction at Curved Surface |
 66%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

Two slabs P & Q of transparent materials have a thickness in ratio 2:5. If a ray of light take same time to move from A to B and B to C then refractive index of Q with respect to P will be:

 

(1) 0.4 

(2) 2.5

(3) 1.4

(4) 1.85

Subtopic:  Refraction at Plane Surface |
 59%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

A ray of light strikes on a glass sphere at point A. If A is midway between P and Q, then the deviation of the ray as it emerges out of the sphere will be

(1) 30°

(2) 45°

(3) 65°

(4) 85°

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