Question

м. А
A student focuses the image of a candle flame, placed at about 4m from a concave lens of
focal length 20cm, on a screen. After that he moves gradually the flame towards the lens and
each time focuses its image on the screen.
la). What is seen on the screen when the flame is very close (at about 10 cm) to the lens?
(b) What happens to the size of the image of the flame formed on the screen? .

(c). What differences is seen in the intensity (brightness) of the image of the flame on the
sopeen?

(d). In which direction does he move the lens to focus the flame on the screen?
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Answer 1

Answer:

not understand

not understand

not understand