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A concave lens of 20 cm focal length forms an image 15 cm from the lens. What is the object distance?
60 cm
30 cm
-60 cm
-30 cm
The answer is c.
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Light travels faster in substance X as compared to substance Y, then refractive index is greater for
Can’t tell with the information provided
Substance-Y
Refractive index for both is same
Substance-X
The answer is b.
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MCQ (Multiple Choice Questions) or Practice Quiz with solutions of Chapter - "Ray Optics" of Class 10 Science, the questions are available for practice
Q. A mirror forms a virtual image of a real object.
It must be a convex mirror.
It must be a concave mirror.
It must be a plane mirror.
It may be any of the mirrors mentioned above.
The answer is D.
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