PHL220H5 Lecture Notes - Lecture 1: New Approach, Physis

i have the equation n1 sin ?1 = n2 sin ?2 and i need to solve for?2 but i haven't taken trig or alg. 2 yet so i am a littlelost by the way the ? are the greek signfor angle and all of the numbers are sub

We wish to obtain an erect image of an object, using a concave mirror of focal length 15 cm. What should be the range of distance of the object from the mirror? What is the nature of the image? Is the image larger or smaller than the object? Draw a ray diagram to show the image formation in this case.

A laser pointer used in a lecture hall emits light at 650 nm. What is the frequency of this light?