Most Important Questions
CBSE Class-X
Subject – Science
Topic-Reflection and Refraction
Q. 1. Where will the image be formed when the object is placed between
the focus and the pole (infinity, pole) of the convex mirror?
Q. 2. With respect to air the refractive index of ice and that of rock
salts are 1.31 and 1.54 respectively. Calculate the refractive index of rock
salt with respect to ice.
Q. 3. With respect to air the refractive index of water and that of
benzene are 1.33 and 1.50 respectively. Calculate the refractive index of
benzene with respect to water.
Q. 4. Wavelength of radiation 850nm falls on a surface. Will this surface
be visible or not? Explain.
Q. 5. A convex mirror used on a truck has 3m radius of curvature. If a
bus is located at 5m from this mirror. Find the position, nature and size of the
image.
Q. 6. What is the condition under which motion pictures can be clearly
seen?
Q. 7. What is accommodation? What is the maximum variation in power of
accommodation in human eye?
Q. 8. An object of size 5cm is placed at a distance of 25cm from the pole
of a concave mirror of radius of curvature 30cm. Cal
Q. 9. An object of size 3cm is placed at a distance of 15cm from a convex
lens of focal length 10cm. Calculate the distance and size of the image so
formed. What will be the nature of image?
Q. 10. Light enters from air to glass plate having refractive index 1.50.
What is the speed of light if the speed of light in air is m/s?
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