A concave mirror of focal length 20cm is placed 50cm from a wall. How far from the wall and object be placed to form its real image on the wall
Answers
Answered by
6
Mirror Formula
→ 1/f = 1/v + 1/u
- u = ?
- v = - 50
- f = - 20
→ 1/(- 20) = 1/(- 50) + 1/u
→ - 1/20 + 1/50 = 1/u
→ (- 5 + 2)/100 = 1/u
→ - 3/100 = 1/u
→ - 100/3 = u
→ - 33.3 = u
Hence the object should be placed 33.3 cm before the mirror.
Answer : - 33.3
Answered by
69
hope this helps u
given:-
u = -50cm
f = -20cm
v= ?
steps:-
⇒1/f=1/v+1/u
⇒1/v=1/f-1/u
⇒1/v=1/-20-[1/-50]
⇒1/v= -1/20+1/50
l.c.m of 20,50 is 100
⇒1/v= -5+2/100
⇒1/v= -3/100
⇒v = 100/-3
⇒v = -33.3 cm
by
hariprasath real name
@rukumanikumaran
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