Reflection and Refraction Quick Check
1. What does the image of an object look like through a convex lens when the object is further from the lens than the focal point?
Answer: It is upside down and smaller than the object
2. What happens when light rays reflect?
Answer: They bounce back.
3. Based on how it refracts light, what would you expect images formed by a concave lens to look like?
Answer: Magnified
4. What happens to light rays when they enter a different medium?
Answer: They bend.
All correct :)
correct
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5)1.68
100% Correct
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To answer these questions, we need to understand the concepts of reflection and refraction.
1. When an object is placed further from a convex lens than its focal point, the image formed would be upside down and smaller than the object. To understand why, we can use the lens equation: 1/f = 1/u + 1/v, where f is the focal length of the lens, u is the object distance, and v is the image distance. When the object is further than the focal point, u > f. Plugging these values into the equation, we find that the image distance (v) is positive, meaning that the image formed is virtual, upright, and smaller than the object.
2. When light rays reflect, they bounce back. This is because when light encounters a smooth, reflective surface, such as a mirror, it follows the law of reflection. The law of reflection states that the incident ray (incoming ray of light), the reflected ray (outgoing ray of light), and the normal (a line perpendicular to the surface at the point of incidence) all lie in the same plane. Additionally, the angle of incidence is equal to the angle of reflection.
3. Based on how a concave lens refracts light, we can expect images formed by it to be magnified. A concave lens is thinner at the center than at the edges, causing light rays passing through it to spread out. This results in the image appearing larger than the object. The image is virtual, upright, and magnified.
4. When light rays enter a different medium, they bend. This bending of light is called refraction. Refraction occurs because light travels at different speeds in different materials, which causes the light rays to change direction. The change in direction depends on the change in speed and the angle at which the light enters the new medium. This is why objects in water appear to be shifted or distorted compared to when they are viewed in air.
Understanding the principles of reflection and refraction helps us explain the phenomena associated with lenses and the behavior of light when it encounters different materials.