Can you take them off?

Yes, here's simple three step process for removing the mirrors; once removed, you cannot reattach unless you use a new piece of adhesive tape.1. Use a pair of scissors to cut a 12-inch-long piece of fishing line. Spray the outside edges of the mirror with water or ammonia window cleaner. Wrap the fishing line around each of your hands so that you have solid control over the line.2. Place the fishing line over the top of the mirror and gently wiggle it back and forth until the fishing line has made its way behind the mirror. Continue to wiggle the fishing line in a sawing motion down the mirror, adding more spray if necessary. Pull the fishing line downward until the mirror detaches.3. Spray a petroleum-based lubricant e.g. WD 40 directly onto the remaining sticky pad, or onto a soft cloth and then soak the residual adhesive pad. Using a soft cloth gently use small circular motions to eliminate the sticky residue left from the blind spot mirror. If the adhesive pad remains, use the petroleum-based lubricant and a plastic credit card to remove the remaining pad.

Do they rotate, and if so do you constantly have to adjust them?

I adjusted mine when I first installed it and haven't touched it since and that's even after taking it through the car wash several times.

Is this made from glass or plastic? Is it magnified?

Great question as I wondered that same thing. They (the mirrors) are "made of glass" or they're "made of plastic", almost a 50/50 split among those that responded to yours and other similar questions. Wouldn't think it would be so difficult to get an accurate response. Looks like cheap quality whatever it is and very likely not glass.

Can someone guide me how to remove these? Nail Polish remover or any other common household item is useful to dissolve the glue?

I read somewhere that you can use dental floss to slowly remove the device from the glass and then use oil / nail polish remover to remove the glue patches.

ASIN	B001DKT0DO
Auto Part Position	Left Outside, Right Outside
Best Sellers Rank	#358,398 in Car & Motorbike ( See Top 100 in Car & Motorbike ) #1,228 in Blind Spot Mirrors
Brand	Fit System
Brand Name	Fit System
Colour	transparent
Compatible with Vehicle Type	Car
Country of Origin	USA
Customer Reviews	4.6 out of 5 stars 7,746 Reviews
Fit Type	Vehicle Specific Fit
Global Trade Identification Number	00759746404008
Item Dimensions	14.6 x 1.9 x 13.3 Centimeters
Item Shape	Round
Item Type Name	Spot Mirror
Item Weight	0.01 Pounds
Item dimensions L x W x H	14.6 x 1.9 x 13.3 Centimeters
Lens Curvature Description	उततल
Manufacturer	Fit System
Manufacturer Part Number	C0400
Material	Glass
Material Type	Glass
Mounting Type	Door Mount
Operation Mode	Manual
Other Special Features of the Product	Adjustable, Lightweight
Size	other
UPC	759746404008
Unit Count	1.0 Count
Vehicle Service Type	Car
What Is In the Box	2 Point Mirrors

Fit System C0400 Driver/Passenger Side Stick-On Adjustable Blind Spot Mirrors - Pack of 2

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