A student wants to project the image of a candle flame on the walls of school laboratory by using a lens :
(a) Which type of lens should he use and why ?
(b) At what distance in terms of focal length `f ' of the lens should he place the candle flame so as to get (i) a magnified, and (ii) a diminished image respectively on the wall ?
(c) Draw ray diagram to show the formation of the image in each case.

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Solution

a) The student should use a convex lens because with the help of convex lens, he would be able to project image on the walls because convex lens will form a real image.

b) (i) In order to form a magnified image on the wall, the candle flame should be placed between F and 2F from the lens.
(ii) In order to form a diminished image on the wall, the candle flame should be placed at a distance greater than 2F from the lens.

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Question 38
A student focused the image of a candle flame on a white screen using a convex lens. He noted down the position of the candle screen and the lens as shown below
Position of candle = 12.0 cm
Position of convex lens = 50.0 cm
Position of the screen = 88.0 cm

(i) What is the focal length of the convex lens?
(ii) Where will the image be formed if he shifts the candle towards the lens at a position of 31.0 cm?
(iii) What will be the nature of the image formed if he further shifts the candle towards the lens?
(iv) Draw a ray diagram to show the formation of the image in case (iii) as said above.

A student has obtained a magnified image of a flame on a screen using a convex lens. To draw the corresponding ray diagram to show the image formation, which of the following two rays whose paths after refraction are shown, should he select?

Q. Rohit focused the image of a candle flame on a white screen using a convex lens.
He noted down the position of the candle, screen, and lens as under:
Position of candle =

26.0

cm
Position of convex lens =

50.0

cm
Position of screen =

74.0

What is the focal length of the convex lens?
Where will the image be formed if he shifts the candle towards the lens at a position of

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Draw a ray diagram to show the formation of the image in case (ii) as said above?

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