1. Optics 1: What happens if you place an object exactly at the focal point of a
ID: 1599273 • Letter: 1
Question
1. Optics 1: What happens if you place an object exactly at the
focal point of a converging lens or mirror?
A The outgoing light rays will be parallel and no image will form.
B An inverted real image will form.
C An inverted virtual image will form.
D The image will be magnified by a factor of 10.
2. Optics 1: An object is placed in front of a converging lens with
the object distance being greater than the focal length. What can you say about the image?
AThe image is virtual and upright
BThe image is real and upright
CThe image is virtual and inverted.
DThe image is real and inverted.
3. Optics 1: A converging lens has a focal length of f = 96.0 cm and the object distance is Do = 145.0 cm. What type of image is produced?
AReal
BIconic
CHolographic
DVirtual
4. Optics 1: A light ray has an incident angle of = 38.2 going from Diamond (ni = 2.42) into Glycerin (nr = 1.47). Because the incident angle is greater than the critical angle total internal reflection occurs. What happens if the Glycerin is replaced with Glass (nr = 1.52)? Assume that the incident angle stays the same.
A The incident ray will pass through the boundary without refracting.
B Total internal reflection does not occur and the light ray will refract with an angle of 22.9o.
C Total internal reflection does not occur and the light ray will refract with an angle of 79.9o.
D Total internal reflection still occurs and the angle of reflection is 38.2o.
Explanation / Answer
1) object is placed at focal point then image will formed at infinity
so option A is correct
2.)OPton D
The image will be real and inverted
3.) option A is correct
real
4.)critical angle = arc Sin(n2/n1)
Theta = arcSin(1.47/2.42)
Option D
Total internal reflection still occurs and the angle of reflection is 38.2o.
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