A lantern gives an image of 3m square of a slide 7.62cm square on a screen. If the screen is 10m from the projection lens of the lantern, calculate the focal length of the lens

Similar Questions

A body of mass 6kg rests on an inclined plane. The normal reaction is R and the limiting frictional ...

The quantity of electric charge stored in a capacitor is measured in ...

Which of the following statements about solid friction are correct? It i. is a force ii. occurs ...

Which of the following statements correctly describe(s) cathode rays? i. they consist of tiny par...

When the tension in a sonometer wire is doubled, the ratio of the new frequency to the initial frequ...

A simple pendulum of mass m moves along an arc pf a circle radius R in a vertical plane as shown abo...

Which of the following conditions are necessary and sufficient for total internal reflection to take...

The main purpose of the transformer in an a.c radio set is to? ...

A lens that is thinner at the middle and thicher at the edges is ...

As the plates of a charged variable capacitor are moved closer together, the potential difference be...