03) A concave less has focal length of 15 cm. At what distance should the object from the lens be placed so that it forms an image at 10 cm from the lens ? also find the magnification produced by the lens.
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GIVEN :
focal length =f=-15 cm after sign conventions
image distance=V=-10cm
object distance=?
by lens formula:
1/f=1/v-1/u
1/u=1/v-1/f
= -1/10+1/15
= -3+2/30
=-1/30
u=-30cm
Magnification=m=v/u
=-10/-30=1/3=0.33
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Answered by
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Answer:
03) एक अवतल कम में 15 सेमी की फोकल लंबाई होती है। लेंस से वस्तु को कितनी दूरी पर रखा जाना चाहिए ताकि यह लेंस से 10 सेमी पर एक छवि बना सके? लेंस द्वारा उत्पन्न आवर्धन का भी पता लगाएं।
Explanation:
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