CONCAVE - Rules for images Flashcards
1
Q
Where is an image formed?
A
where atleast 2 reflectd rays intersect (or appear to do so)
2
Q
Why do we use only ‘2’ rays?
A
bcs they help in finding the image position!
3
Q
RULE 1
A
A ray of light parallel to principal axis passes thru its focus
4
Q
RULE 2
A
ray passing thru centre of curvature is reflctd back along the same path
5
Q
Explanation behind rule 2?
A
bcs it strikes the mirror normaly/ perpendicularlyy! -> angle i = angle r = 0, had 2 arrowheads
6
Q
rule 3
A
Ray passing thru the focus become parallel to the principal axis after reflection
7
Q
RULE 4
A
Ray which is incident at the pole reflects the ray back making the same angle with the axis, here pole is considered as the normal, IF RAY IS INCIDENT ALONG AXIS IT IS INCIDENT ALONG AXIS
