Lenses and Optics

Question 1

The sign convention for R for a concave lens will be greater than or less than zero?

Answer 1

For a concave lens side the radius(R) will be negative

Question 2

The sign convention for R for a convex lens will be greater than or less than zero?

Answer 2

For a convex lens side the radius(R) will be positive

Question 3

In a converging lens the centre of the lens will be thicker than the edges or thinner?

Answer 3

In a converging lens the centre will be thicker than the edges.

Question 4

In a diverging lens, the centre of the lens will be thicker or thinner than the edges?

Answer 4

The diverging lens will have a centre that is thiner then the edges.

Question 5

What is a plano convex/concave lens/mirror

Answer 5

it is where one of the sides has a radius of curvature = inf

Question 6

What is the Lensmaker’s equation?

Answer 6

1/f = (n-1)(1/R1+1/R2)

Question 7

The focal point for a converging lens will be positive or negative?

Answer 7

Positive

Question 8

The focal point for a diverging lens will be positive or negative?

Answer 8

Negative

Question 9

What is the Thin-lens equation

Answer 9

1/f = 1/v+1/u

Question 10

What is the formula for Angular magnification

Answer 10

M = theta’/theta

Question 11

What is the formula for maximum magnification?

Answer 11

Mmax = 1 + d/f

Question 12

What is the formula for minimum magnification?

Answer 12

Mmin = d/f

Question 13

What is Hyperopia

Answer 13

It is a far-sighted disorder where you can see far but not close

Question 14

With what type of lens is Hyperopia treated with?

Answer 14

A converging lens

Question 15

What is Myopia

Answer 15

It is a near-sighted disorder where you can see close but not far.

Question 16

With what type of lens is Myopia treated with?

Answer 16

A diverging lens

Question 17

When looking at someone lenses to treat Myopia, will their face look bulged or shrunk?

Answer 17

Their face will look shrunk.

Question 18

When looking at someone lenses to treat Hyperopia, will their face look bulged or shrunk?

Answer 18

Their face will look bulged

Question 19

What are the lenses used in a compound microscope?

Answer 19

The first is the eye lens and the second is the objective lens.

Question 20

In a compound microscope, the object is placed near what lens?

Answer 20

the objective lens.

Question 21

What type of lenses do compound microscopes use?

Answer 21

Two converging lenses.

Question 22

Maximum total Magnification is calculated by what equation

Answer 22

M = -L/fo(1+d/fe) where L is the tube length and fo indicates that the object is precicly at the focal length.

Question 23

What is Chromatic aberration?

Answer 23

It is where the index of refraction of a material varies with the wavelength of the light that passes through it.

Question 24

In a lens or mirror equation, ‘O’ represents what?

Answer 24

The object height

Question 25

In a lens or mirror equation, 'I' represents what?

Answer 25

The image height

Question 26

In a lens or mirror equation, 'u' represents what?

Answer 26

The object distance

Question 27

In a lens or mirror equation, 'v' represents what?

Answer 27

The image distance

Question 28

Magnification is is calculated through what formula

Answer 28

M = -v/u = I/O

Question 29

The sign convection for v will be greater than or less than zero for real images?

Answer 29

Greater than zero.

Question 30

The sign convection for v will be greater than or less than zero for virtual images?

Answer 30

Less than zero

Question 31

The sign convection for I will be greater than or less than zero for upright images?

Answer 31

Greater than zero

Question 32

The sign convection for I will be greater than or less than zero for inverted images?

Answer 32

Less than zero

Question 33

The sign convection for Magnification(M) will be greater than or less than zero for inverted images?

Answer 33

Less than zero

Question 34

The sign convection for Magnification(M) will be greater than or less than zero for upright images?

Answer 34

Greater than zero

Question 35

For a concave mirror, an object inside the focal point will make what type of image?

Answer 35

It will create a virtual image that is larger.

Question 36

For a concave mirror, an object between the centre of curvature and the focal point will make what type of image?

Answer 36

It will create a real image that is inverted and larger than the object.

Question 37

For a concave mirror, an object at the centre of curvature(C) point will make what type of image?

Answer 37

It will create a real image that is inverted but exactly the same as the object in height.

Question 38

For a concave mirror, an object at the focal point will make what type of image?

Answer 38

It will not create any image

Question 39

What type of image does a convex mirror make when the object is placed at any distance from the mirror

Answer 39

At any distance expect exactly in-front of the mirror it will create a virtual image that is upright and smaller. As the object is moved farther away from the mirror the image slowly approaches the focal point of the mirror

Question 40

For any type of mirror, v will be positive or negative for a virtual image?

Answer 40

negative

Question 41

The focal point for a convex mirror will be positive or negative?

Answer 41

negative