Question

In figure PQR is a straight line and PQS : SQR = 7 : 5. Find SQR​

Answer 1

Answer:

Draw ray diagram showing the image formation by a convex lens when an object is placed

a) between optical centre and focus of the lens

b) between the focus and twice the focal length of the lens

c) at twice the focal length of the lens

d) at infinity

e) at the focus of the lens

Answer 2

Answer:

ratio of angle PQS and SQR=7:5

both angles are supplementary to each other

means

angle PQS+angle SQR=180⁰

7x+5x=180⁰

12x=180⁰

x=180/12

x=15

angle SQR=5x

=> 5×15

x=75

so angle SQR=75⁰

please mark me as brainlist it is too important for me