An object 4cm in size, is placed at 25cm infront of a concave mirror
of focal length 15cm. At what distance from the mirror whould a screen be
placed in order to obtain a sharp image?Find the nature and the size of the
ne nive cases.
Example
image.
Reflection of Licht in Different Surfaces
Answers
Answered by
1
Answer:
The screen should be placed at a distance of 37.5 cm on the object side of the mirror, to obtain a sharp image of the object. The image formed is real, inverted (because h' is negative) and enlarged in size. A concave lens of focal length 15 cm forms an image 10 cm from the lens.
Answered by
2
Answer: v = -37.5cm
nature of the image = real and inverted size = +6 cm
Explanation:
height of object = +4cm
object distance = -25 cm ( distance object to the left side of the mirror is negative)
focal length = -15 cm ( focal length of concave mirror is -ve
mirror formula = 1/v - 1/u = 1/f
1/v = 1/u - 1/f
1/v = (-1/15) - (-1/25)
1/v = -2/75
v = -37.5
nature of the image is real and inverted
h' = h(-v/u)
h' = 4*(-37.5/-25)
h' = +6cm
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