Please post some questions from guide for ch 10 lightclass 10 science
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Q)A convex lens has a focal length of 10 cm. At what distance from the lens should the object be
placed so that it forms a real and inverted image 20 cm away from the lens? What would be the size of
the image formed if the object is 2 cm high? With the help of a ray diagram show the formation of the
image by the lens in this case.
Q)An object 2 cm high is placed at a distance of 64 cm from a white screen. On placing a convex lens
at a distance of 32 cm from the object it is found that a distinct image of the object is formed on the
screen. What is the focal length of the convex lens and size of the image formed on the screen? Draw a
ray diagram to show the formation of the image in this position of the object with respect to the lens.
Q)How far should an object be placed from a .convex lens of focal length 20 cm to obtain its image at a
distance of 30 cm from the lens? What will be the height of the image if the object is 6 cm tall?
Q)The image of an object placed at 60 cm in front of a lens is obtained on a screen at a distance of 120
cm from it. Find the focal length of the lens. What would be the height of the image if the object is 5
cm high?
Q)Define ‘refractive index of a transparent medium.’ What is its unit? Which has a higher refractive
index, glass or water?
Q)An object is placed between infinity and the pole of a convex mirror. Draw a ray diagram and also
state the position, the relative size and the nature of the image formed.
Q)A convex lens has a focal length of 10 cm. At what distance from the lens should the object be
placed so that it forms a real and inverted image 20 cm away from the lens? What would be the size of
the image formed if the object is 2 cm high? With the help of a ray diagram show the formation of the
image by the lens in this case.
Q)An object 2 cm high is placed at a distance of 64 cm from a white screen. On placing a convex lens
at a distance of 32 cm from the object it is found that a distinct image of the object is formed on the
screen. What is the focal length of the convex lens and size of the image formed on the screen? Draw a
ray diagram to show the formation of the image in this position of the object with respect to the lens.
Q)How far should an object be placed from a .convex lens of focal length 20 cm to obtain its image at a
distance of 30 cm from the lens? What will be the height of the image if the object is 6 cm tall?
Q)The image of an object placed at 60 cm in front of a lens is obtained on a screen at a distance of 120
cm from it. Find the focal length of the lens. What would be the height of the image if the object is 5
cm high?
Q)Define ‘refractive index of a transparent medium.’ What is its unit? Which has a higher refractive
index, glass or water?
Q)An object is placed between infinity and the pole of a convex mirror. Draw a ray diagram and also
state the position, the relative size and the nature of the image formed.
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