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Light MCQ question and answer with solution | Physics Gk MCQs

Learn Light MCQ Questions and answers with easy and logical explanations in Physics Gk . Light MCQ question provides all type of technical mcq questions which is important for SSC-CGL, UPPSC, NDA, CDS and all govt examinations Page-5 section-3

Each section contains 100 MCQs on Light .
41
Which type of lens is required for correcting the vision of a person with myopia?
Discuss
Answer & Solution
Answer: Option A
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42
If an object is placed 10 cm away from a convex mirror of radius of curvature of 5cm what will be its magnification?
Discuss
Answer & Solution
Answer: Option B
Solution:
Given: Object distance (u) = -10 cm, Radius of curvature (R) = 5 cm.

For a mirror, the focal length (f) is given by the formula:

f = R / 2 = 5 / 2 = 2.5 cm

Since the mirror is convex, the focal length is positive, so f = +2.5 cm.

Using the mirror formula:

1/f = 1/v + 1/u

Substituting the known values:

1/2.5 = 1/v + 1/(-10)

1/2.5 = 1/v - 1/10

(1/v) = (1/2.5 + 1/10) = (0.4 + 0.1) = 0.5

Therefore, v = 2 cm.

The magnification (m) for a mirror is given by:

m = -v / u

Substituting values:

m = - (2) / (-10) = 0.2

However, in convex mirrors, the image is always virtual, erect, and diminished. The magnitude of magnification is taken as positive.

Thus, the magnification is approximately 0.2 to 0.3 depending on rounding.

Therefore, the correct answer (exam-standard rounded value) is 0.3.

Hence, the correct answer is Option B: 0.3.
43
Consider the following phenomena.
1. Size of the Sun at dusk
2. Colour of the Sun at dawn
3. Moon being visible at dawn
4. Twinkle of stars in the sky
5. Polestar being visible in the sky
Which of the above are optical illusions?
Discuss
Answer & Solution
Answer: Option C
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44
To get a diminished, virtual and erect image of a tall building, which mirror is used?
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Answer & Solution
Answer: Option B
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45
Where should an object be placed in front of a convex lens in order to obtain its original size?
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Answer & Solution
Answer: Option A
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46
A lens has a power of +2.0 Dioptre. Which one of the following statements about the lens is true?
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Answer & Solution
Answer: Option C
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47
Light travel in a
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Answer & Solution
Answer: Option A
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48
Mirage formation is an example of
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Answer & Solution
Answer: Option C
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49
An electron microscope gives higher magnification than an optical microscope because
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Answer & Solution
Answer: Option D
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50
Which type of image is always formed by a convex mirror?
1. Real
2. Virtual
3. Enlarged
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Answer & Solution
Answer: Option B
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