Can you see a virtual image? Can you photograph one? Can one be projected onto a screen with additional lenses or mirrors? Explain your responses.

Why is the index of refraction always greater than or equal to 1?

Can you see a virtual image? Explain your response.

Can you see a real image by looking backward along the direction from which the rays come? Can you see a virtual image? Explain. Can you tell by looking whether an image is real or virtual? If not. how can the two be distinguished?

Find the power dissipated in each of these extension cords: (a) an extension cord having a $0.0600-\Omega$ resistance and through which 5.00 A is flowing; (b) a cheaper cord utilizing thinner wire and with a resistance of $0.300\ \Omega.$

Discuss how to orient a planar surface of area $A$ in a uniform electric field of magnitude $E_0$ to obtain $(a)$ the maximum flux and $(b)$ the minimum flux through the area.

Can real images be projected on a screen? Can virtual images? Can either be photographed? Discuss carefully.

(a) Describe the difference between a real image and a virtual image.

(b) Can your eyes tell the difference?

(c) How can you tell the difference on a ray diagram?

(d) How could you tell the difference between a virtual image and a real image experimentally?

(e) If you were to take a photograph of a virtual image, would you see the image in the photograph?

(f) If you were to put a CCD digital sensor at the location of a virtual image, would the image be captured on the sensor?

(b) Explain any differences in your answers to parts $(e)$ and $(f)$.

Write the differences between real and virtual images. How can you tell (by looking) whether an image formed by a single lens or mirror is real or virtual?

What are the differences between real and virtual images? How can you tell (by looking) whether an image formed by a single lens or mirror is real or virtual?

What is meant by a negative magnification? What is meant by a magnification that is less than 1 in magnitude?

Explain why an object in water always appears to be at a depth shallower than it actually is? Why do people sometimes sustain neck and spinal injuries when diving into unfamiliar ponds or waters?

What are the key differences between real images and virtual images?

A thin lens has two focal points, one on either side, at equal distances from its center, and should behave the same for light entering from either side. Look through your eyeglasses (or those of a friend) backward and forward and comment on whether they are thin lenses.