# The distance between the object and its real image formed by a concave mirror is minimum when the distance of the object from the centre of curvature of the mirror is: [f $\to$ focal length of the mirror] 1.  Zero 2.  $\frac{\mathrm{f}}{2}$ 3.  f 4.  2f

Subtopic:  Reflection at Spherical Surface |
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

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

 1 10 cm from the mirror 2 20 cm from the lens 3 - 20 cm from the lens 4 -15 cm from the mirror

Subtopic:  Lenses |
52%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

A person can see objects clearly between 1 m and 3 m. The power of lens required to correct near point will be:

1.  $-$2.5 D

2.  + 3 D

3.  + 1.5 D

4.  $-$1.75 D

Subtopic:  Human Eye |
67%
From NCERT
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In the 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 |
71%
From NCERT
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Two slabs P & Q of transparent materials have a thickness in the ratio 2 : 5. If a ray of light takes the same amount of time to move from A to B and B to C, then the 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 |
63%
From NCERT
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In the following diagram, what is the distance x if the radius of curvature is R = 15 cm?

1. 30 cm

2. 20 cm

3. 15 cm

4. 10 cm

Subtopic:  Refraction at Curved Surface |
78%
From NCERT
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In the diagram shown below, the image of the point object O is formed at $$l$$ by the convex lens of focal length 20 cm, where $$F_1$$ and $$F_2$$ are foci of the lens. The value of $$x'$$ is:

 1 10 cm 2 20 cm 3 30 cm 4 40 cm
Subtopic:  Lenses |
72%
From NCERT
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A glass slab is placed with the right-angled prism as shown in the figure. The possible value of $$\theta$$ such that light incident normally on the prism does not pass through the glass slab is:

 1 $$30^\circ$$ 2 $$37^\circ$$ 3 $$45^\circ$$ 4 Both (1) & (2)

Subtopic:  Total Internal Reflection |
From NCERT
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A graph is plotted between the angle of deviation $$\delta$$ in a triangular prism and the angle of incidence as shown in the figure. Refracting angle of the prism is:

 1 $$28^\circ~$$ 2 $$48^\circ~$$ 3 $$36^\circ~$$ 4 $$46^\circ~$$
Subtopic:  Prisms |
73%
From NCERT
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Three identical thin convex lenses are kept as shown in the figure. A ray passing through the lens is shown. The focal length of each lens is:

 1 5 cm 2 10 cm 3 15 cm 4 20 cm
Subtopic:  Lenses |
53%
From NCERT
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