Investigating light

What is the speed of light in a vacuum?

The speed of light in a vacuum is approximately 3×10⁸ meters per second

How does light behave when it travels through different media?

Light slows down when it enters a denser medium and bends towards the normal.

How is light refracted when passing through a glass block?

Light slows down and bends towards the normal as it enters the block, then speeds up and bends away from the normal when it exits.

What is the index of refraction for glass?

The refractive index for glass is typically around 1.5.

How does the angle of incidence affect the angle of refraction?

As the angle of incidence increases, the angle of refraction also increases, but the relationship is dependent on the refractive index.

What happens when light hits a mirror at a right angle?

Light will reflect directly back along its original path.

How can you calculate the focal length of a lens?

Use the lens formula: 1/f=1/u+1/v, where f is the focal length, u is the object distance, and v is the image distance.

What is the focal point of a lens?

The focal point is the point where parallel rays of light converge after passing through a lens.

What is the difference between a concave and convex lens?

A concave lens diverges light, whereas a convex lens converges light.

How can you measure the focal length of a lens?

Place an object at a known distance from the lens, measure the image distance, and use the lens formula.

How does a lens form an image?

A lens bends light rays to converge (or diverge) at a point, forming a real or virtual image.

What is the importance of lenses in the human eye?

Lenses in the eye focus light on the retina, allowing for clear vision.

How does a microscope use lenses?

A microscope uses multiple lenses to magnify small objects by bending light rays to create a larger image.

How does a telescope use lenses?

A telescope uses lenses to collect and focus light from distant objects, magnifying the image.