1)An ____ lens is used to produce a real image.

A)convex
B)concave
C)plane
D)diverging

The link you gave me confused me b/c the closest thing I could find was convex. and you said concave mirrors produce virtual images. but the question doesnt ask for virtual they ask for real.

2)What is the nature of an image formed by a concave mirror of focal length 10 cm for a real object placed 3 cm from the mirror?

Virtual and inverted.

(10)(3)/3-10
-4.29

1. I didn't say anything about concave mirrors. THe question was on lenses. There are two types: concave (diverging), and convex (converging). If concave lenses produce only virtual images, what does that imply about convex?

Here is my previous brief response to the same question:
<<concave lenses form virtual images. They are often called diverging lenses, because they spread light apart. >>

What I recommend is that you take a few cases of convex and concave lenses, put an object somewhere, and examine the image. Is it real, or virtual? These ought to come to you readily.

After you get that, do the same for mirrors.

That ray diagram would answer question two. By nature of the image, they are looking for whether it is real or virtual, inverted or erect, and enlarged or not. A ray diagram answers that readily, in which you can discern your answer is not right on one count. You ought to state if it is enlarged or not.

If you want to check your diagram (dont cheat), http://www.glenbrook.k12.il.us/GBSSCI/PHYS/mmedia/optics/rdcmd.html

1) "what does that imply about convex?"

it implies that they produce real images

2)they are only looking for 2 things.

A)real and inverted
B)real and upright
C)virtual and inverted
D)virtual and upright

my 1st answer was A but someone said no

I was right on 2 answers that I had that I was told were wrong.

1)Specular reflection obeys the laws of reflection while diffuse reflection does not. True or false

I said false and I asked dwrls I believe, to explain why he said that was true

and 2)A rod of length 5.0 cm lies along the axis of a concave mirror of radius of curvature 20 cm. The end of the rod closer to the mirror is 15 cm from the mirror. Find the length of the image of the rod.

all I had to do was find the focal length which was 10 cm

1) The correct answer is A) convex lens. Convex lenses are thicker in the middle and thinner at the edges. When light passes through a convex lens, it converges and forms a real image. The other options, concave, plane, and diverging lenses do not produce real images. To determine this, you can use the property that convex lenses converge light rays and form real images.

2) To determine the nature and location of the image formed by a concave mirror, you can use the mirror formula:

1/f = 1/v - 1/u

Where:
f = focal length of the mirror (given as 10 cm)
v = image distance from the mirror
u = object distance from the mirror (given as 3 cm)

Plugging in the values, we have:

1/10 = 1/v - 1/3

To solve for v, we can simplify the equation:

1/v = 1/10 + 1/3

1/v = (3 + 10)/30

1/v = 13/30

Now, we can calculate v by taking the reciprocal:

v = 30/13

The nature of the image formed by a concave mirror for a real object placed 3 cm from the mirror is virtual. However, the image being inverted suggests that it is a real image. Since the image is formed behind the mirror, it is referred to as being virtual and inverted when compared to the object.