A narrow beam goes from air into glass at a known angle to the normal, and the glass index is given. Which relationship should be used to find the angle inside the glass?

A student knows a lens focal length and the object distance, and needs the image distance. Which relationship is the best starting point?

A radio station's broadcast frequency is given, and an engineer needs the wavelength of the signal in air. Which relationship should be selected?

A camera lens forms an image, and the problem asks how the image height compares with the object height, including whether the image is inverted. Which relationship directly gives that ratio?

A laser ray hits a plane mirror, and the outgoing direction must be predicted from the incoming angle. Which relationship applies?

Light travels inside a glass fiber toward the lower-index cladding, and the problem asks for the incident angle at which the refracted ray would skim the boundary. Which relationship fits?

A beam's speed is measured inside a transparent plastic, and the problem asks for the plastic's index of refraction. Which relationship is needed?

A polarized beam passes through a second polarizing filter at a known angle, and the transmitted intensity is needed. Which relationship should be used?

A spherical concave mirror's radius of curvature is measured, and the focal length is needed. Which relationship connects them?

A student writes: 'A red apple looks red because it adds red color to the white light falling on it.' Which correction is right?

A student writes: 'Any converging lens forms a real image because its rays bend toward each other.' Which correction is right?

A student writes: 'When light enters a higher-index material at an angle, it bends away from the normal.' Which correction is right?

A student writes: 'Virtual images cannot be photographed because no light really comes from the image location.' Which correction is right?

A student writes: 'A blue filter turns white light blue by adding blue light to it.' Which correction is right?

A student writes: 'A brighter green laser has photons with more energy than a dimmer green laser.' Which correction is right?

A student writes: 'When red and green light overlap on a screen, they mix like paint and make a dark color.' Which correction is right?

A student writes: 'Mixing cyan and yellow pigments is additive color mixing, so the result should be white.' Which correction is right?

A student uses 30° from the mirror surface as the incident angle in a reflection problem. Which correction is right?

A student writes: 'A convex safety mirror can form a real, inverted image if the object is far enough away.' Which correction is right?

Read the ray diagram. Which description matches the image formed by the drawn rays?

The diagram shows a converging lens and its principal rays. Which description fits the image?

Use the drawn rays for the converging lens. What kind of image do they indicate?

Look at the diverging-lens ray diagram. Which description matches the image?

Read the concave-mirror diagram. Which image description is correct?

The concave-mirror diagram shows the object between F and C. Which description matches the image?

Use the concave-mirror diagram. What image do the rays show for the object inside the focal length?

Look at the convex-mirror ray diagram. Which description fits the image?

Read the plane-mirror diagram. Which statement correctly describes the image?

The converging-lens diagram places the object at 2f. Which image description is correct?

Light in air (n = 1.00) strikes water (n = 1.33) at 40° from the normal. What is the refracted angle in the water?

Light travels from glass (n = 1.50) into air (n = 1.00) at 30° from the normal. What is the refracted angle in air?

Light inside water (n = 1.33) hits a water-air boundary. What is the critical angle for total internal reflection?

A material has index of refraction n = 1.50. Using $c=3.00\times 10^8$ m/s, what is the speed of light in the material?

A red laser in air has frequency $4.74\times 10^{14}$ Hz. Using $c=3.00\times 10^8$ m/s, what wavelength is closest?

A concave mirror has focal length 20 cm. An object is 60 cm in front of it. Where is the image?

A converging lens has focal length 10 cm. An object is 30 cm from the lens. What is the image distance?

A diverging lens has focal length −12 cm. An object is 24 cm from the lens. What is the image distance?

An object is 25 cm in front of a lens, and its virtual image has dᵢ = −15 cm. What is the magnification?

A lens forms a real image 40 cm from the lens of a 3.0 cm tall object placed 20 cm from the lens. What is the image height?

A ray strikes a plane mirror at 35° from the normal. What angle does the reflected ray make with the normal?

Light travels from glass (n = 1.50) into water (n = 1.33) at 35° from the normal. What is the refracted angle in water?

A rescue team uses long-distance radio communication, heat sensors to find a person at night, and imaging for a cracked bone. Which order is increasing frequency?

One electromagnetic form heats food in an oven, one is detected by the eye in a display, and one sterilizes a lab surface. Which order is increasing frequency?

A technician compares radiation used for thermal imaging, airport security scans, and nuclear-source medical treatment. Which order is increasing frequency?

A broadcast tower sends AM signals, a radar system sends microwaves, and a heat lamp emits infrared. Which order is increasing frequency?

A theater uses a visible spotlight, a clinic uses ultraviolet for sterilizing, and a cancer treatment device uses gamma rays. Which order is increasing frequency?

A router sends Wi-Fi, a barcode scanner uses red light, and a medical image uses x-rays. Which order is increasing frequency?

A remote control uses infrared, a tanning lamp uses ultraviolet, and a tracer emits gamma rays. Which order is increasing frequency?

A station transmits FM radio, a stage uses visible light, and a sterilizer uses gamma rays. Which order is increasing frequency?

A police speed detector uses microwaves, a water purifier uses ultraviolet, and a medical device uses gamma rays. Which order is increasing frequency?