A beam of light converges at a point P. Now a lens is placed in the path of the convergent beam 12cm from P. At what point does the beam converge if the lens is a convex lens of focal length 20cm?

1. 7.5 cm away from the lens on the left side.
2. 7.5 cm away from the lens on the right side.
3. 6.5 cm away from the lens on the left side.
4. 6.5 cm away from the lens on the right side.

Subtopic:  Lenses |
 67%
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NEET 2023 - Target Batch - Aryan Raj Singh
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An object of size 3.0 cm is placed 14 cm in front of a concave lens of focal length 21 cm.  the image produced by the lens is:

1. inverted and virtual.
2. erect and real. 
3. erect and virtual. 
4. inverted and real.

Subtopic:  Lenses |
 65%
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NEET 2023 - Target Batch - Aryan Raj Singh
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What is the focal length of a convex lens of focal length \(30\) cm in contact with a concave lens of focal length \(20\) cm?
(Ignore the thickness of the lenses.)
1. \(-45~\mathrm{cm}\)
2. \(-55~\mathrm{cm}\)
3. \(-50~\mathrm{cm}\)
4. \(-60~\mathrm{cm}\)

Subtopic:  Lenses |
 79%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

 A compound microscope consists of an objective lens of focal length 2.0 cm and an eyepiece of focal length 6.25 cm separated by a distance of 15 cm. How far from the objective should an object be placed in order to obtain the final image at the least distance of distinct vision (25 cm)?

1. 2.5 cm
2. 0.5 cm
3. 1.5 cm
4. 5.0 cm

Subtopic:  Simple & Compound Microscope |
 58%
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A person with a normal near point \((25~\text{cm})\) using a compound microscope with an objective of focal length \(8.0~\text{mm}\)  and an eyepiece of focal length \(2.5~\text{cm}\) can bring an object placed at \(9.0~\text{mm}\) from the objective in sharp focus. What is the separation between the two lenses?
1. \(7.20~\text{cm}\)
2. \(9.47~\text{cm}\)
3. \(2.50~\text{cm}\)
4. \(2.27~\text{cm}\)

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

A small telescope has an objective lens of a focal length \(144\) cm and an eyepiece of focal length \(6.0\) cm. What is the magnifying power of the telescope?
1. \(30\)
2. \(20\)
3. \(24\)
4. \(32\)

Subtopic:  Telescope |
 87%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

A giant refracting telescope at an observatory has an objective lens of focal length \(15\) m. If an eyepiece of focal length \(1.0\) cm is used, what is the angular magnification of the telescope?
1. \(1175\)
2. \(1250\)
3. \(1300\)
4. \(1500\)

Subtopic:  Telescope |
 83%
From NCERT
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A small pin fixed on a table top is viewed from above from a distance of \(50~\text{cm}\). By what distance would the pin appear to be raised if it is viewed from the same point through a \(15~\text{cm}\) thick glass slab held parallel to the table? (The Refractive index of glass is \(1.5\))
1. \(5~\text{cm}\)
2. \(3~\text{cm}\)
3. \(3.5~\text{cm}\)
4. \(4.5~\text{cm}\)

Subtopic:  Refraction at Plane Surface |
 72%
From NCERT
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A cross-section of a ‘light pipe’ made of a glass fiber of refractive index 1.68. The outer covering of the pipe is made of a material of refractive index 1.44. What is the range of the angles of the incident rays with the axis of the pipe for which total reflections inside the pipe take place, as shown in the figure?



1. \(0^\circ<i<45^\circ\)
2. \(0^\circ<i<60^\circ\)
3. \(45^\circ<i<75^\circ\)
4. \(45^\circ<i<90^\circ\)

Subtopic:  Total Internal Reflection |
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The image of a small electric bulb fixed on the wall of a room is to be obtained on the opposite wall 3 m away by means of a large convex lens. What is the maximum possible focal length of the lens required for the purpose?

1. 0.60 cm
2. 0.01 m
3. 0.75 m
4. 0.65 m

Subtopic:  Lenses |
 60%
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