Curved Mirrors
Why are convex mirrors useful for security or vehicle mirrors?
What is because they provide a wider field of view?
Light bends toward the normal when entering a medium with a ______ index of refraction.
What is higher?
A biconvex lens can also be described as a _______ lens.
What is converging lens?
If light travels at 2.00 × 10⁸ m/s in a medium, find its index of refraction.
What is 1.50? (3.00 × 10⁸ / 2.00 × 10⁸)
Describe the path of a ray that enters a diverging mirror parallel to the principal axis.
What is it reflects and appears to come from the focal point on the object side?
What happens to the image when the object is placed at the center of curvature in a concave mirror?
What is the image is the same size, inverted, and real?
Explain what happens during partial refraction.
What is when part of the light reflects off the boundary while the rest refracts into the second medium?
A converging lens brings parallel rays to meet at this point.
What is the principal focus (F)?
A material has an index of 1.33. Calculate the speed of light in it.
What is 2.26 × 10⁸ m/s?
When an object is at 2F’, describe the image formed by a converging lens.
What is same size, inverted, and real at 2F?
A converging lens produces no image when the object is placed at this location. Explain why.
What is at the focal point, because refracted rays exit parallel and never converge or diverge?
Total internal reflection only occurs when light travels from a ______ to a ______ medium.
What is denser to less dense?
Diverging lenses are thinner in the ______ and thicker at the ______.
What is center and edges?
A diverging lens has f = –15 cm and an object at 30 cm. Find the image distance.
What is –10 cm? (1/–15 = 1/30 + 1/di)
Describe the three principal rays used to construct a ray diagram for a diverging lens.
What is: (1) parallel ray refracts as if from F, (2) ray through optical center continues straight, (3) ray toward F’ refracts parallel to axis?
In the mirror equation, 1/f=1/do+1/di what sign conventions are used for convex mirrors?
What is 1/fand 1/di are both negative, since the focal point and image are located behind the mirror?
Describe why a rainbow involves both dispersion and partial internal reflection.
What is because light refracts into raindrops (dispersing by wavelength) and then partially reflects inside before exiting?
Explain why no image forms when the object is at the focal point of a converging lens.
What is because the refracted rays exit parallel and never converge or appear to diverge?
Light enters a diamond (n = 2.42) from air (n = 1.00) at 20°.
Find the refraction angle.
8.1°
What happens to the speed of light as it enters a denser medium?
What is speed decreases?
Describe the image position, size, and type for an object placed very far from a convex mirror (SALT).
What is a virtual, upright, and extremely small image located at the focal point behind the mirror?
Explain how a mirage occurs using changes in air density and refractive index.
What is when light bends gradually due to layers of air at different temperatures, creating an inverted or displaced image?
Explain how a converging lens can project a real image onto a screen, while a diverging lens cannot.
What is because the refracted rays actually converge and cross on the opposite side of the lens?
A ray of light travels from glass (n = 1.52) into water (n = 1.33).
Find the critical angle for total internal reflection.
61.0°
Explain why light bends upward when forming an inferior mirage.
What is because light bends away from the normal as it moves from cooler, denser air to warmer, less dense air near the ground?