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Answer

 

1/f=1/v+1/u

1/f=1/4+1/2

1/f=3/4

f=4/3

f=1.3 m

option c

Answer
object distance (u)= 2m, image distance (v)= 4m, since object and image are in left hand side ,so by rules,. u = -2, v = -4, (1/u)+(1/v) = 1/f, 1/(-2)+1/(-4) = 1/f, 1/f = -(1/2+1/4)= -3/4, f = -4/3 = -1.33 (negative value because focal point in left hand side). focal length (f) = 1.33 .
Answer

1/f=1/v+1/u

1/f=1/4+1/2

1/f=3/4

f=4/3

f=1.3 m option c

Answer

Mirror formula : 1/f = 1/v + 1/u = 1/4 + 1/2 = 3/4 .

Hence, f = 4/3 m = 1.3 m (approx)

Answer

For a concave mirror,

u = +2m

v = +4m

So, by the formula 1/f = 1/u + 1/v

i.e. 1/f = 1/2 +1/4

implies 1/f = 3/4

Therefore, f = 4/3 = 1.33m

Answer

1/f  = 1/v+ 1//u  = 1/4 + 1/2  = 3/4

f= 4/3 = 1.3    i.e option  C

  

 

 

Answer

Ans. Option C (1.3 m)

Applyinf the Mirror formula : 1/f = 1/v + 1/u = 1/4 + 1/2 = 3/4 .

Hence, f = 4/3 m = 1.3 m (approx)

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