MCQ- 21 ICSE Physics class 10 ch-2 Light

Class 10 - Light Quiz (Focal Length Estimation Methods)

1. In the distant object method, the object should be:

At infinity
At 2F
At F
Between F and 2F

2. In the distant object method, the image formed is:

Real and Inverted
Virtual and Erect
Real and Erect
Virtual and Inverted

3. The auxiliary plane mirror method is used to:

Determine the exact focal length
Measure the refractive index
Calculate lens power
Find the lens thickness

4. In the auxiliary plane mirror method, the mirror:

Reflects the light back to the lens
Absorbs the light
Magnifies the image
Reduces the image size

5. The focal length estimated using the distant object method is:

Always accurate
Approximate
Doubled
Half the actual value

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