Class 10 Physics · Chapter 5 · Test 3
Test 3: Complete Chapter – Optical Devices, Applications and Calculations
30 questions · 25 min · 30 marks
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Sample questions
The first 5 of 30. Try each one, then tap to see the answer.
Question 1
The optical device which uses a convex lens to magnify an object by creating a virtual image:
- Acamera
- Bmicroscope
- Cmagnifying glass
- Dslide projector
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Answer: C
A magnifying glass uses a convex lens with the object closer than the focal length to form a virtual, upright, magnified image.
Question 2
The optical device which works on the principle of inverting an image for projection is:
- Amagnifying glass
- Bphotograph Enlarger
- Cslide projector
- Dplane mirror
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Answer: C
Textbook key: in a slide projector the slide is placed upside down because the projection lens inverts the image.
Question 3
In a simple camera, the image formed on the film is:
- Avirtual, erect and magnified
- Breal, inverted and diminished
- Creal, erect and enlarged
- Dvirtual and inverted
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Answer: B
The object is beyond 2F, forming a real, inverted and smaller image on the film.
Question 4
In a simple camera, the lens-film distance is fixed and equal to the:
- Afocal length of the lens
- Btwice the focal length
- Chalf the focal length
- Dobject distance
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Answer: A
The textbook states the lens-film distance is fixed and equal to the focal length.
Question 5
In a slide projector, the slide is positioned:
- Abeyond 2F
- Bbetween the lens and F
- Cbetween F and 2F
- Dat infinity
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Answer: C
The slide is between F and 2F to form a real, magnified and inverted image.
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