Question

1. The focal point for a flat mirror depends on where the object is located in front of the mirror.

True/ false

2. If the tension on a string is increased, then the wave speed also increases.

true/ false.

Just want to be sure. Thanks.

Answer 1

1. False

focal point is the point in space at which light incident towards the mirror and traveling parallel to the principal axis will meet after reflection. The image distance always equals the object distance. The size of the image is the same as the object (the mirror does not magnify the image).

2. True

V= √(T/(m/l))

T is tension in string

M is mass

L is length

So wave speed is directly proportional to root T.

So if we increase tension in string then wave speed will increase.

Hope you got. Please upvote my hardwork thanks