light and sound

what is the critical angle

• the angle which light needs to be at to be seen

• the angle where light can be refracted into a rainbow

• the largest angle that light can be angles at before total internal reflection occurs

• the angle that allows a light ray to pass through an opaque object

Answer explanation

he critical angle is the largest angle that light can be directed at before total internal reflection occurs. At the critical angle the light will travel across the boundary of the 2 mediums. Or 90 degrees to the Normal, this 90 degrees is the largest angle that the light will be able to refract to because OTHERWISE IT WILL BE REFLECTING INWARDS 😮. CRITICAL ANGLE IS ONLY RELEVANT IN WHEN IT IS A DENSER MEDIUM TO A LESS DENSE MEDIUM.

What is Hyperopia?

Answer explanation

 Hyperopia (or long-sightedness), is the inability to see close objects clearly while distant objects may be clear. The light ray isn’t converged enough to make a clear image on the retina (the back of the eye). When an image is further away the person will be able to see it cleared because the light will be able to focus on the retina.

what is myopia

• long-sightedness where the light focuses after the retina

• a eye disease which is commonly found in young children

• the disorder where the iris on each eye appears a different colour

• short-sightedness where the light will focus before the retina

Answer explanation

Shortsightedness, is where you can see close objects clearly but distant objects are hard to see. This is due to the light focusing before it reaches the retina causing the distant images to appear unclear. Focal point is in front of the retina

Myopia correction

• concave lens glasses

• removal of eye

• convex lens glasses

• flat lenses glasses

hyperopia correction

• concave lensed glasses

• convex lensed glasses

• flat lensed glasses

• no correction needed as 2 different eye colours is ok :)

biconvex lens refraction?

• light is refracted inwards to form a focal point

• light refracted outwards with a virtual focal point

• light is bounced off the lens at the critical angle

• light is curved through the lens

biconcave lens refraction

• light is refracted inwards forming a focal point

• light is refracted outwards with a virtual focal point on the other side of the lens

• light is refracted into a rainbow

• light disapears due to absobtion

which is true?

• When a light ray passes from a less dense medium to a more dense medium the light will refract TOWARDS the normal.

• when light passes from a less dense medium to a more dense medium light will refract AWAY from the normal

which is true

• When a light ray passes from a more dense material into a less dense material it will refract TOWARDS the normal

• When a light ray passes from a more dense material to a less dense material it will refract AWAY FROM the normal.

what is total internal reflection?

• when the angle of incidence is larger than the critical angle the light will reflect inside the medium

• light moves in a circle inside a circular shaped medium

• there is no possibility of total internal reflection happening unless in a vaccum (eg space)

• when the angle of incidence is smaller than the critical angle the light will reflect inside the medium