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Can you explain the answer of this question below:
A concave lens of 20 cm focal length forms an image 15 cm from the lens. What is the object distance?
  • A:
    60 cm
  • B:
    30 cm
  • C:
    -60 cm
  • D:
    -30 cm
The answer is c.
Verified Answer
Can you explain the answer of this question below:A concave lens of 20...
Focal length= -20(as it is concave lens)
v= -15 (as concave lens always forms virtual and erect image on left of lens)
Putting these values in lens formula,
1/ -20 - 1/u = 1/ -15
-1/ u= 1/-15 + 1/20
-1/u = -4+3/60
-1/u = -1/60
-u = -60
[u =60]
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Can you explain the answer of this question below:A concave lens of 20...
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Community Answer
Can you explain the answer of this question below:A concave lens of 20...
1/f=1/v-1/u
1/-20=1/-15-1/u
-1/20+1/15=-1/u
-3+4/60=-1/u
1/60=-1/u
u=-60cm
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Can you explain the answer of this question below:A concave lens of 20 cm focal length forms an image 15 cm from the lens. What is the object distance?A:60 cmB:30 cmC:-60 cmD:-30 cmThe answer is c.
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Can you explain the answer of this question below:A concave lens of 20 cm focal length forms an image 15 cm from the lens. What is the object distance?A:60 cmB:30 cmC:-60 cmD:-30 cmThe answer is c. for Class 10 2024 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about Can you explain the answer of this question below:A concave lens of 20 cm focal length forms an image 15 cm from the lens. What is the object distance?A:60 cmB:30 cmC:-60 cmD:-30 cmThe answer is c. covers all topics & solutions for Class 10 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Can you explain the answer of this question below:A concave lens of 20 cm focal length forms an image 15 cm from the lens. What is the object distance?A:60 cmB:30 cmC:-60 cmD:-30 cmThe answer is c..
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