If the focal length of a camera lens is 20cm, the distance from the film at which the lens must be set to produce a sharp image of an object 100cm away is

Similar Questions

The heat capacity of a substance is the energy ...

Which of the following instruments can be used to measure current in an a.c circuit? ...

What is the name of the model of the atom that describes electrons as orbiting the nucleus in specif...

A solid suspended by a piece of string is completely immersed in water. On attempting to lift the so...

Heat is radiated by hot objects in the form? ...

counting of currency notes with moist fingers is based on the principles of? ...

A cell can supply current of 0.4 A and 0.2 A through a 4.0Ω and 10.0Ω resistors respectively. T...

Which of the following diagrams correctly illustrates the mode of oscillation of air in a tube for t...

In which of the points labelled A, B, C, D and E on the conductor shown would electric charge tend t...

The ice and steam points of a certain thermometer are -20° and 100° respectively. ...