Light – Reflection and Refraction
Class 10 · Science · 29 Questions
Define the principal focus of a concave mirror.
The radius of curvature of a spherical mirror is 20 cm. What is its focal length?
Name a mirror that can give an erect and enlarged image of an object.
Why do we prefer a convex mirror as a rear-view mirror in vehicles?
Find the focal length of a convex mirror whose radius of curvature is 32 cm.
A concave mirror produces three times magnified (enlarged) real image of an object placed at 10 cm in front of it. Where is the image located?
A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?
Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is m s.
The refractive index of diamond is 2.42. What is the meaning of this statement?
Define 1 dioptre of power of a lens.
A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex lens if the image is equal to the size of the object? Also, find the power of the lens.
Find the power of a concave lens of focal length 2 m.
Which one of the following materials cannot be used to make a lens?
The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object?
Where should an object be placed in front of a convex lens to get a real image of the size of the object?
A spherical mirror and a thin spherical lens have each a focal length of cm. The mirror and the lens are likely to be
No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be
Which of the following lenses would you prefer to use while reading small letters found in a dictionary?
We wish to obtain an erect image of an object, using a concave mirror of focal length 15 cm. What should be the range of distance of the object from the mirror? What is the nature of the image? Is the image larger or smaller than the object? Draw a ray diagram to show the image formation in this case.
Name the type of mirror used in the following situations. (a) Headlights of a car. (b) Side/rear-view mirror of a vehicle. (c) Solar furnace. Support your answer with reason.