Q. No.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. \(9.5~\text{cm}\)
1. \(14~\text{cm}\)
2. \(2~\text{cm}\)
3. \(19~\text{cm}\)
4. \(9.5~\text{cm}\)
| 1. | \(\frac{\sqrt{3}}{2} \) | 2. | \(1.5 \) |
| 3. | \(1.732 \) | 4. | \( 2\) |
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.
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
| Assertion (A): | The nature of the image of an object depends on the size of the mirror. |
| Reason (R): | It is not possible to obtain a real image by a plane mirror. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
If total deviation produced by two plane mirrors is then number of images formed of an object placed symmetrically is
1. 5
2. 11
3. 2
4. 7
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.
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
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.
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.
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