A compound microscope has an objective lens with a focal length of \(1.5~\text{cm}\) and an eyepiece of focal length \(5~\text{cm}\). It is focussed on an object which is at a distance of \(1.8~\text{cm}\). The length of the microscope for normal adjustment is: 
1. \(14~\text{cm}\)
2. \(2~\text{cm}\)
3. \(19~\text{cm}\)
4. \(9.5~\text{cm}\)

Subtopic:  Simple & Compound Microscope |
 69%
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When a ray of light falls on a given plate at an angle of incidence \(60^{\circ}\), the reflected and refracted rays are found to be normal to each other. The refractive index of the material of the plate is:

1. \(\frac{\sqrt{3}}{2} \) 2. \(1.5 \)
3. \(1.732 \) 4. \( 2\)
Subtopic:  Refraction at Plane Surface |
 76%
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Assertion: The focal length of a convex mirror is always takes as positive.

Reason: A real image of a real object cannot be obtained with a convex mirror.

(1) Both Assertion and Reason are true and the reason is the correct explanation of the assertion.

(2) Both Assertion and Reason are true but the reason is not the correct explanation of the assertion.

(3) Assertion is a true statement but Reason is false.

(4) Both Assertion and Reason are false statements.

Subtopic:  Reflection at Spherical Surface |
 60%
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A white beam of light can deviate without dispersion by

1.  using two suitable glass prisms placed in the same sense

2.  using two suitable glass prisms placed in the opposite sense 

3.  Using a suitable glass prism

4.  None of these

Subtopic:  Prisms |
 84%
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Assertion: The nature of the image of an object depends on the size of the mirror.

Reason: It is not possible to obtain a real image by a plane mirror.

(1) Both Assertion and Reason are true and the reason is the correct explanation of the assertion.

(2) Both Assertion and Reason are true but the reason is not the correct explanation of the assertion.

(3) Assertion is a true statement but Reason is false.

(4) Both Assertion and Reason are false statements.

Subtopic:  Reflection at Plane Surface |
 65%
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If total deviation produced by two plane mirrors is 300° then number of images formed of an object placed symmetrically is

1.  5

2.  11

3.  2

4.  7

Subtopic:  Reflection at Plane Surface |
 63%
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Assertion: A convex lens may be diverging.

Reason: The nature of a lens depends upon the refractive index of the lens and that of the surrounding medium.

(1) Both Assertion and Reason are true and the reason is the correct explanation of the assertion.

(2) Both Assertion and Reason are true but the reason is not the correct explanation of the assertion.

(3) Assertion is a true statement but Reason is false.

(4) Both Assertion and Reason are false statements.

Subtopic:  Lenses |
 78%
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A man runs towards a stationary plane mirror with a velocity 15 m/s. The magnitude of the velocity of the man relative to his image is

1.  15 m/s

2.  30 m/s

3.  45 m/s

4.  Zero

Subtopic:  Reflection at Plane Surface |
 74%
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Assertion: The air bubble shines in water.

Reason: Air bubble in water shines due to the refraction of light.

(1) Both Assertion and Reason are true and the reason is the correct explanation of the assertion.

(2) Both Assertion and Reason are true but the reason is not the correct explanation of the assertion.

(3) Assertion is a true statement but Reason is false.

(4) Both Assertion and Reason are false statements.

Subtopic:  Refraction at Curved Surface |
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Assertion: A convex mirror is used as a rearview mirror.

Reason: Convex mirror always forms a virtual, erect, and diminished image for real objects.

(1) Both Assertion and Reason are true and the reason is the correct explanation of the assertion.

(2) Both Assertion and Reason are true but the reason is not the correct explanation of the assertion.

(3) Assertion is a true statement but Reason is false.

(4) Both Assertion and Reason are false statements.

Subtopic:  Reflection at Spherical Surface |
 76%
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