Exploring Optics Concepts

What are the key characteristics of a concave mirror?

• Key characteristics of a concave mirror include inward curvature, ability to form real and virtual images, focal point in front, and magnification of close objects.

• Focal point behind the mirror

• Only forms virtual images

• Outward curvature

List two applications of convex mirrors.

• Window glass

• 1. Vehicle side mirrors 2. Security surveillance systems

• Car headlights

• Bathroom mirrors

Derive the mirror formula and explain each term.

• 1/f = 1/v + 1/u

• 1/f = 1/u - 1/v

• f = v + u

• 1/v = 1/f - 1/u

What is the critical angle in total internal reflection?

• The critical angle is always 90 degrees.

• The critical angle is calculated using θc = arcsin(n2/n1).

• The critical angle is calculated using θc = sin(n1/n2).

• The critical angle is the angle of incidence at which light is completely absorbed.

Explain the conditions necessary for total internal reflection to occur.

• Total internal reflection requires a light source that emits ultraviolet light.

• Total internal reflection occurs when light travels from a denser medium to a less dense medium at an angle greater than the critical angle.

• Total internal reflection can happen at any angle of incidence regardless of the media involved.

• Total internal reflection occurs when light travels from a less dense medium to a denser medium.

Describe one practical application of total internal reflection.

• Prisms for dispersing light

• Lenses for magnifying objects

• Mirrors for reflecting light

• Optical fibers for communication.

Calculate the focal length of a concave mirror if the object distance is 30 cm and the image distance is 15 cm.

• -30 cm

• 15 cm

• -15 cm

• 30 cm

What type of image is formed by a convex mirror?

• A real, inverted, and enlarged image.

• A virtual, upright, and diminished image.

• A virtual, inverted, and enlarged image.

• A real, upright, and diminished image.

If the radius of curvature of a concave mirror is 20 cm, what is its focal length?

• 5 cm

• -10 cm

• 15 cm

• -20 cm

How does the image size change when using a convex mirror?

• The image size decreases and is always smaller than the object.

• The image size can be either larger or smaller depending on the distance.

• The image size remains the same as the object.

• The image size increases and is larger than the object.