Optics

Question 1

What type of image is formed by a prism?

Answer 1

Erect

Virtual

Displaced toward apex

Neither enlarged or diminished

Question 2

What is a prism dioptre?

Answer 2

Deviation of light caused by the prism, measured in cm deviation per metre

8 dioptres = 8 cm deviation per metre

1 prism dioptre also = 0.5 degrees of angle deviation

Question 3

Angle of deviation =

Answer 3

(refractive index-1) x refractive angle

(refractive index in glass is typically 1.5)