Optics Answers

A convex mirror has a radius of 20 cm. An object is placed 30 cm in front of the mirror. Determine how tall the image is if the object is 5.0 cm tall. Also determine the magnification.

A. 1.3cm and 0.25
B 2.3cm and 0.25
C. 1.3cm and 0.15
D. 2.3cm and 0.15

A convex mirror has a radius of 20 cm. An object is placed 30 cm in front of the mirror. Determine where the image will appear.

A. −4.5cm
B. −5.5cm
C. −6.5cm
D. −7.5cm

Describe the image of a candle positioned 20cm in front of a concave mirror of focal length 30cm

A. virtual, inverted, 12cm behind mirror and magnified 3 times
B. real, inverted, 12cm in front of mirror and diminished 3 times
C. virtual, erect, 60cm behind mirror and magnified 3 time
D. real, erect, 60cm in front of mirror and diminished 3 times

Calculate the distance and magnification of an object placed 20cm from a converging lens

A. 60cm and 0.3 times the size of object
B. 20cm and 0.3 times the size of object
C. 60cm and 3 times the size of object
D. 80cm and 3 times the size of object

In an experiment involving a spherical mirror, 1/v was plotted on the vertical axis and 1/u on the horizontal axis. What is the linear magnification?

A. slope of the graph
B. inverse of the slope of the graph
C. intercept on the vertical axis
D. intercept on the horizontal axis

Describe the image of a candle positioned 20cm in front of a concave mirror of focal length 30cm

A. virtual, inverted, 12cm behind mirror and magnified 3 times
B. real, inverted, 12cm in front of mirror and diminished 3 times
C. virtual, erect, 60cm behind mirror and magnified 3 time
D. real, erect, 60cm in front of mirror and diminished 3 times

An estimate of the refractive index of glass is 1.5. If the angle of incidence is 30 degrees the angle of refraction is

A. 19 degrees
B. 60 degrees
C. 35 degrees
D. 70 degrees

The critical angle for total internal reflection at an air - water interface is approximately 48o. In which of the following situations will total internal reflection occur.

A. light incident in water at 40o
B. light incident in water at 55o
C. light incident in air at 40o
D. light incident in air at 55o

Find the position and magnification, m, of the image formed by a concave mirror of focal length 24 cm when an object is placed 40 cm from the mirror given that m is V/U.

A. 50cm and 2.4
B. 60cm and 2.4
C. 50cm and 1.5
D. 60cm and 1.5

calculate the maximum wavelength of microwave radiation that will absorbed at 0 k in a) pb, Tc= 7.19 K , b)Al,Tc= 1.2 k