plz guys answer me its urgent!!!
a screen is placed 90 cm from an object the image can be focused on the screen by placing lens at 2 diffrent places 20 cm apart what is the focus of the lens
Answers
Answered by
1
Distance between the object and the screen is D=90cm
Distance between two location of the screen is d=20cm
∴ f=D²−d²/4D
=90²−20²/4×90
=21.4cm
gurdeenkaur31:
r u sure about this because my maam said that its a HOTS question
its D^2-d^2/4D
BY MISTAKE THE SIGN DIDNT COME THROUGH MY PHONE NOW I AM DOING IT THROUGH COMPUTER
BY THE WAY ANSWER IS CORRECT IF U PUT THE SIGN
I AM IN 11TH WHO IS WILLING TO TAKE PHYSICS AS MAIN IN FUTURE.
IT SHOULD B CORRECT
BY MISTAKE THE SIGN DIDNT COME THROUGH MY PHONE NOW I AM DOING IT THROUGH COMPUTER
BY THE WAY ANSWER IS CORRECT IF U PUT THE SIGN
I AM IN 11TH WHO IS WILLING TO TAKE PHYSICS AS MAIN IN FUTURE.
IT SHOULD B CORRECT
NOW ITS CORRECT
ANY DOUBT INBOX ME
thxx
anytym
Answered by
3
Distance between the object and the screen is D=90cm
Distance between two location ofand the screen is d=20cm
∴f=D2−d24D
=902−2024×90
=21.4cm
Distance between two location ofand the screen is d=20cm
∴f=D2−d24D
=902−2024×90
=21.4cm
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