Question

for concave mirror f=5cm,u=10cm,v=10cm as per sign convention rules which is correct a)f=5cm,u=10cm,v=10 b)f=5 u=10cm ,v=_10cm c) f=_5cm u=10cm,v=+10cm d)f=5cm,u=10cm,v+10​

Answer 1

Answer:

In concave mirror, using sign convention. u=−10cm ... (b) again using sign convention. u=−5c ... v=+15cm. Image is formed at a distance of 15 cm behind the mirror .

Answer 2

Sign convention for concave mirror will be f=-5cm, u=-10cm, v=+10cm

Given:

Concave mirror

f=5cm

u=10cm

v=10cm

To find:

Sign convention for concave mirror.

Solution:

• Concave mirror is a type of spherical mirror which is curved inwards.
• In concave mirrors the objects are always placed infront of the mirror hence the sign of object distance (u) is negative (-).
• In concave mirrors the focal length of the mirror lies infront of the mirror hence the sign of focal length (f) is negative (-).
• In concave mirrors if the images are formed infront of the mirror then the sign of image distance (v) will be negative (-). and if he images are formed behind the mirror then the sign of image distance (v) will be positive (+) .

Therefore, the sign convention for concave mirror will be f=-5cm, u=-10cm, v=+10cm.

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