Register
an object is 25 cm away from a convex len.the height of the image is twice the height of the object.find it's focal length.
154k views
4 votes
an object is 25 cm away from a convex len.the height of the image is twice the height of the object.find it's focal length.

User Sriman Reddy
by
7.1k points

1 Answer

4 votes
Object distance = 25cm, u = 25cm

Image = 2 = v/u; v = 2*u = 2*25 = 50cm

By mirror formula:

1/u + 1/v = 1/f

1/25 + 1/50 = 1/f

1/f = 1/25 + 50

1/f = (2 + 1)/50

1/f = 3/50

f = 50/3

f ≈ 16.667 cm
User Mfnx
by
7.0k points
Ask a Question
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

7.3m questions

9.8m answers

Other Questions

What is the meant by the frequency of a wave? What is the unit?
Is this true or false ethics deals with morals and values and can be measured and tested using the scientific method. Thank you for answering and your help
How many newtons of force would 200 grams apply? What would be the mass of an object that weights 7 N on earth? If an object weights 450 N. How much does it weight in pounds?
An 800kg roller coaster starts from top of a 45m hill with a velocity of 4m/s. The car travels to the bottom, through a loop, and continues up the next hill. The end of the roller coaster has a level surface
What forms of energy are produced by a violin
Link Copied!