* Solve the Following examples.
* An object of height 7 cm is kept at a distance of 25 cm in front of a concave mirror. The focal length of the mirror is 15 cm. At what distance from the mirror should a screen be kept so as to get a clear image? What will be the size and nature of the image?
(Ans = 37.5cm and 10.5cm. Image is real)
* Answer is given but i want it in Solved format.
* Please help!
Answers
Answered by
1
Answer:
Size of object h
o
=7cm
Size of the object h
o
=?
Focal length f=−15cm
Object distance u=−25cm
Image distance v=?
Using mirror formula,
f
1
=
v
1
+
u
1
−15
1
=
v
1
+
−25
1
v
1
=
75
−5+3
v=−37.5cm
Hence, position of image at 37.5cm infront of the mirror.
Magnification(M)=
h
o
h
i
=
u
−v
=
−25
37.5
=−1.5
h
i
=−1.5×h
O
h
i
=−1.5×7=−10.5cm
Hence,size of image is
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