Optics Answers

A camera obscura used by a potrait painter is located 6 m from a child who stands 1 m tall. How tall is her image if the back of the camera obscura is 2 m away?

What effect does enlarging of the hole in a pinhole camera have on the image? The image gets
larger
smaller
shaper
fuzzier

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?

how is linear polarized light converted into circular polarize light

how linearly polarized light converted into linear polarized light with differen azimuth angle

1 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.

−45cm
−55cm
−6.5cm
−7.5cm

A ray incident on a glass prism undergoes minimum deviation when:
incident angle is equal to the angle of refraction
refraction angle equals 90o
incident angle equals 90o
incident angle is equal to the angle of emergency

In an experiment involving the convex lens, which of the following is NOT correct?

images must always be sharply focused
the tip of object pin must be at the same height as the center of lens
images obtained must always be magnified
parallax error must be avoided

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

60cm and 0.3 times the size of object
20cm and 0.3 times the size of object
60cm and 3 times the size of object
80cm and 3 times the size of object

Which of the following is NOT true of experiments involving curved mirrors?

image distance is negative for for real image
object distance is positive
image distance is negative for virtual image
focal length is negative for convex mirrors