Physics Past Questions and Answers

Which of the following statements is not correct for a light ray passing through a rectangular glass block which is surrounded by air? It

A Suffers a displacement at the point of emergence
B Emerges parallel to the incident ray
C Is partly reflected at the point of incidence
D Is deviated at the point of emergence
E Is reflected in the block

Question 262:

In an experiment to measure1 the focal length f of a converging lens object distances u and corresponding image distance were measured and 1/u plotted against 1/v to obtain the graph illustrated. How would f be determined from this graph?

A F= the slope of the graph
B F= the intercept on the 1/u axis
C F =the intercept on the 1/v axis
D F = reciprocal of the slope
E F = reciprocal of the intercept on either axes

Question 263:

The image of a pin formed by a diverging lens of focal length 10cm is 5cm from the lens. Calculate the distance of the pin from the lens

A -3.3cm
B 3.3cm
C 10.0cm
D 15.0cm
E 20.0cm

Question 264:

As an object is moved close to the focus of a converging lens from infinity its image I. moves closer to the lens II. moves away from the lens. III. Remains the same size. IV becomes smaller. Which of the statements above is/are correct?

A III and IV only
B I and III only
C IV only
D III only
E II only

Question 265:

A real image of an object fom1ed by a converging lens of focal length 15cm is three times the size of the object. What is the distance of the object from the lens?

A 30cm
B 25cm
C 20cm
D 15cm
E 10cm