Skip to main content

Reflection & Refraction

Reflection

Reflection means if light hits any surface material, it will bounce back. Reflection has it's laws
1) the incident angle and the reflected angle are the same.
2) the incident angle, reflected ray and the normal line of the surface must all lie on the same plane.

To get the image resulted from reflection phenomenon , we need to draw ray diagram based on a few principles. One of the path taken by the ray is the incident ray go straight to the mirror parallel to principal axis and then reflected through focal point.

Where is the focal point?

Focal point is the middle point between pole  and the centre of the curvature of the mirror

Thank you,
Mdm Ummi Atiah KMPk
~ May it Benefits You ➽đŸ’•
Labels:

Comments

Post a Comment

Popular posts from this blog

Magnetic Field

Magnetic Field, B To define Magnetic field, we start with the word field. Field means a region or space. The magnetic field is defined as a region where the magnetic force can be felt. In other words, a force (repel/attract) can be felt in the region. Bar Magnet We will find that 2 North(N) poles will repel if we bring the poles of two bar magnets together. Same goes to that of 2 South(S) poles. However North and South pole attracts. The strength and direction of the field are represented by lines. Knowing that, the direction of magnetic field is from North to South. Magnetic field is able to be detected by 1) Compass (have been used over 2000 years 2) Hall Probe Applications: Swipe cards, Video tapes & Computer discs -use magnetism to store information. History: In 1819, Hans Christian Oersted noticed that a compass needle was deflected by an electric current in a nearby wire. Remember!! the compass is used to detect any existance of magnetic field. By th...
1 comment
Read more

Root Mean Square Current (I rms)

Root Mean Square Current As mentioned in the previous post , the value of AC is always changing. Then, how do we measure its value??? We could not use the maximum value of the current Io, because it only occurs at a moment. The average current is ZERO . Hence, one effective value that we could use the root mean square value. Irms . The formula for   Irms is given by: where Io is maximum current. Irms is the value that is equivalent to a steady direct current .  We can investigate this by comparing 2 circuits containing lamp each. circuit 1 uses battery as the source, while circuit 2 uses a.c. supply. AC supply is adjusted so that both lamps are equally bright. At this point, DC and AC supplies are transferring energy to the lamps at the same rate (Power).  By equating the Power of both circuits, we can deduce the equation of  Irms as above. Therefore, the d.c. voltage equals the r.m.s. value of the a.c. voltage.  From the the graph below and th...
4 comments
Read more

Thinking-based Learning (TBL)

Since I were small, I always felt down as I thought that I am/was not a creative person. When I joined a group task of inventing something for Science subject, I would always be the last person that came out with ideas and usually my ideas were not as superb as my group mates. But then, to cut the story short, I realized that  it is not impossible for every one of us to be creative. The turning point was from my Curriculum Design class taught by Dr Razak, where he taughts us the steps in invention anything for the purpose of survival, for example, creating scissors for the left-handed person. Among the method that I strongly remember is SCAMPER which also called as creativity tool. SCAMPER stands for substitute, combine, adapt, modify, put into other use, eliminate & rearrange. BY undergoing SCAMPER, it is possible for someone to be creative and able to invent one new product!! Throughout teaching and learning, we always involved with thinking process. Our government also ...
Post a Comment
Read more