Please I need some help with this question
A cicular opaque disk, 25cm in diameter, is set up 30 cm from a circular source of light of diameter 40 cm. A screen is placed 30cm beyond the opaque disk. Describe, giving dimensions, the nature of the shadow on the screen.
Can someone please help me- don't know how to get started?
To determine the nature of the shadow on the screen, we need to consider the relative sizes and positions of the objects involved.
Here are the steps to analyze the situation:
1. Determine the relative sizes of the objects:
- The diameter of the circular opaque disk is given as 25 cm.
- The diameter of the circular source of light is given as 40 cm.
2. Determine the distance between the objects:
- The circular opaque disk is set up 30 cm from the circular source of light.
- The screen is placed 30 cm beyond the opaque disk.
3. Analyze the shadow:
- When an opaque object blocks a light source, it casts a shadow.
- Since the diameter of the source of light (40 cm) is larger than the diameter of the opaque disk (25 cm), the entire opaque disk will be within the shadow of the source of light.
- The shape of the shadow on the screen will be a circular shape, the same as the shape of the opaque disk.
- The dimensions of the shadow will be the same as the dimensions of the opaque disk, which is 25 cm in diameter.
- The distance between the opaque disk and the screen will not affect the dimensions or shape of the shadow.
Therefore, the shadow on the screen will be a circular shape with a diameter of 25 cm.