Q20 of 25 Page 10

"A concave mirror of focal length 'f' can form a magnified erect as well as an inverted image of an object placed in front of it." Justify this statement stating the position of the object with respect to the mirror in each case for obtaining these images. ( CBSE 2013)

"A concave mirror of focal length 'f' can form a magnified erect as well as an inverted image of an object placed in front of it." This statement is completely justified and can be proved as follows:



Object distance

Nature of the image formed

At distance less than Focus

Virtual, Erect and magnified

At focus

Real, inverted and highly magnified

At distance more than focus but less than 2f

Real, inverted and magnified.

At distance more than 2f

Real, inverted and diminished

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The image of a candle flame placed at a distance of 30 cm from a spherical lens is formed on a screen placed on the other side of the lens at a distance of 60 cm from the optical centre of the lens. Identify the type of lens and calculate its focal length. If the height of the flame is 3 cm, find the height of its image. ( CBSE 2015)

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A spherical mirror produces an image of magnification -1 on a screen placed at a distance of 50 cm from the mirror.(a) Write the type of mirror.(b) Find the distance of the image from the object.(c) What is the focal length of the mirror?(d) Draw the ray diagram to show the image formation in this case. ( CBSE 2014)