Question

A drop of water on a countertop reflects light from a flower held 2.60 cm directly above it. The flower's diameter is 1.60 cm, and the diameter of the flower's image is 0.15 cm. What is the focal length of the water drop, assuming that it may be treated as a convex spherical mirror?

Answer #1

A doctor examines a mole with a 15.1 cm focal length magnifying
glass held 11.4 cm from the mole How big is the image in
millimeters if the mole is actually 4.2 mm in diameter?
What is the focal length of 2.4 D reading glasses found on the
rack in a pharmacy?
How far, in centimeters from the lens must the film in a camera
be, if the lens has a 36.3 mm focal length and is being used to...

1. When a cupcake is placed 12.5 cm12.5 cm away from the center
of a concave mirror, its image is located 50.1 cm50.1 cm behind the
mirror. What is the focal length of the mirror?
2. You have a concave spherical mirror with a 11.3 cm11.3 cm
radius of curvature. You place an object on the mirror's axis, 18.7
cm18.7 cm in front of the mirror. How far is the object's image
from the mirror?
3. You are given a...

A doctor examines a mole with a 15.1 cm focal length magnifying
glass held 11.4 cm from the mole How big is the image in
millimeters if the mole is actually 4.2 mm in diameter?
What is the focal length of 2.4 D reading glasses found on the
rack in a pharmacy?
How far, in centimeters from the lens must the film in a camera
be, if the lens has a 36.3 mm focal length and is being used to...

1. how far are you from your image when you stand 0.759 m in
front of a concave mirror with
radius of curvature 582cm? Read question carefully to see what
is being asked for.
2. An object is 12 cm in front of a convex spherical mirror,
and the image is 3.0 cm behind the
mirror. What is the focal length of the mirror?

1. A 3.50 mm object is placed 13.0 cm in front of a lens that
has a focal length of -6.50 cm, a second lens is 25.0 cm from the
first and has a focal length of 9.00 cm. What is the final height
of the image formed, is it virtual or real?
2. Assuming the lenses of a person's eyeglasses are 2.10 cm from
their eyes, what power of lens must be used to correct the vision
of a...

A dentist’s mirror is placed 2.3 cm from a tooth. The enlarged
image is located 6.2 cm behind the mirror. (a) What kind of mirror
(plane, concave, or convex) is being used? (b) Determine the focal
length of the mirror. (c) What is the magnification? (d) How is the
image oriented relative to the object?

An object is placed 10-cm from a convex mirror. An image 0.5
times the size of the object is formed. What is the focal length of
the mirror?
–10 cm
+10 cm
None of the choices is correct.
+5 cm
–5 cm

An object 1.50 cm high is held 2.80 cm from a person's cornea,
and its reflected image is measured to be 0.174 cm high.
(a)What is the magnification?
(b)Where is the image (in cm, from the corneal "mirror")
Find the radius of curvature (in cm) of the convex mirror formed
by the cornea. (Note that this technique is used by optometrists to
measure the curvature of the cornea for contact lens fitting. The
instrument used is called a keratometer, or...

A doctor examines a mole with a 20 cm focal length magnifying
glass held 15 cm from the mole. (a) Find the image distance.
(b) What is its magnification?
(c) How big is the image of 8 mm diameter mole?
(d) Draw a labelled ray diagram for the questions above (a to
c).
(e) Find the power of the magnifying glass.
(f) Find the index of refraction of the material of the magnifying
glass if the wavelength of light in...

An object is held 82.7 cm away from a lens. The lens has
a focal length of -31 cm.
A.) Determine the image distance
B.) Determine the magnification.
C.) If the object is 4 cm long, determine the image
height
D.) Which of the following are true about the
image?
The image is virtual
the image is upright
the image is inverted
the image is real
E) Which is true about the lens?
The lens is concave
the lens is...

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